a	Flowers nearly always irregular Petals imbricate in bud, free or some of them united Seeds usually without an areole
	b	Flowers regular Petals valvate in bud, often united basally Sepals usually united basally Stamens as many as petals or twice as many or numerous, free or all united into a tube or to the base of the petals Anthers uniform, dehiscing lengthwise, sometimes with a deciduous gland at the apex Leaves bipinnate or, rarely, pinnate in indigenous species Seeds normally with an areole on each face or side

	a	Adaxial (uppermost) petal overlapped on each side by the adjacent lateral petals (when present) Sepals often free Stamens 10 or fewer, free or, less often, variously united Anthers uniform, rarely dimorphic, dehiscing lengthwise or by terminal pores Leaves mostly pinnate or bipinnate, rarely simple or 1-foliolate Seeds with radicle usually straight
	b	Adaxial (uppermost) petal outside the adjacent lateral petals or wings and usually forming with the keel-petals an irregular corolla Sepals united basally Stamens 10 or rarely fewer, rarely free, most often the adaxial ones free or nearly so and the other 9 united, sometimes united into 2 groups of 5 or all united Anthers mostly dehiscing lengthwise Leaves very rarely bipinnate (Rhynchosia) Seeds with radicle usually curved

	a	Plant armed with prickles or spines
	b	Plant unarmed

	a	Inflorescence bicoloured, the upper part bisexual, yellow, the lower neuter, mauve, pink or white Short lateral branches terminating in spines, plants otherwise unarmed	Dichrostachys
	b	Inflorescence concolorous Plants armed with recurved prickles or stipular spines, very rarely short lateral branchlets terminating in spines

	a	Plant armed with spine-tipped lateral shoots, recurved prickles and stipular spines 0 Inflorescence globose Stamen filaments united basally into a tube	Albizia
	b	Plant armed with recurved prickles or stipular spines, spine-tipped lateral branchlets 0

	a	Flowers in globose or subglobose heads, rarely the inflorescence reduced to only 2-4 flowers per 'head'
	b	Flowers in spikes or spiciform racemes

	a	Stamens as many as or twice as many as the (3)4-5(6) corolla lobes
	b	Stamens many (± 35-200)

	a	Small rigid much-branched shrub with pale green to olive, cano-puberulous, substriate branches Stipules spinescent, recurved, up to 3.5 mm long Leaves small, each with 1 pinna pair Stamens 10, the 5 opposite the petals shorter than those alternating with the petals Anthers with a minute deciduous apical gland	Xerocladia
	b	Annual or perennial herb or small shrub Stems armed with scattered prickles and usually densely hispid or setulose Stipules not spinescent, persistent Leaves sensitive to touch, with (1)2-14 pinnate pairs Stamens 4 or 8 Anthers eglandular apically Flowers pink or mauve	Mimosa

	a	Inflorescence reduced to 2-4 flowers Flowers pink Filaments shortly united into a tube, basally	Calliandra
	b	Inflorescence not as above Flowers mostly white, yellowish white, bright or deep yellow Filaments free	Acacia

	a	Stamens 10
	b	Stamens many (± 35-200)

	a	Recurved prickles scattered along the stem Pods compressed, slightly curved to falcate, at maturity the valves splitting transversely into 1-seeded segments	Adenopodia
	b	Straight stipular paired spines Pods slightly curved or coiled, indehiscent, not segmented	*Prosopis

	a	Petioles glandular Stamen filaments free Pods mostly dehiscent, various	Acacia
	b	Petioles eglandular Stamen filaments shortly connate basally Pods indehiscent, falcate or spirally coiled	Faidherbia

		a	Inflorescence capitate, globose or subglobose
		b	Inflorescence elongate, spicate or racemose

	a	Aquatic herb with creeping, usually floating and swollen stems Flowers of two sorts, bisexual in upper part of head, neuter with elongate staminodes in lower part	Neptunia
	b	Tree, shrub or suffrutex, rarely herbaceous and then not aquatic

	a	Leaves reduced to simple, entire phyllodes	Acacia
	b	Leaves bipinnate

	a	Stamens 10
	b	Stamens many to numerous (± 19-200)

	a	Leaves with 1 pinna pair Leaflets large, 20-60 mm wide Large tree up to 15 m high	Xylia
	b	Leaves with (2)3-8 pinnae pairs Leaflets small, less than 5 mm wide Perennial herb, suffrutex, shrub or small tree

	a	Anthers with conspicuous scattered hairs Flowers in heads up to 18 mm in diameter Shrub or small tree with densely grey-puberulous branchlets Leaflets 1.5-4.0 mm wide	*Leucaena
	b	Anthers glabrous Flowers in heads up to 8 mm in diameter Perennial herb or suffrutex with subglabrous to sparingly puberulous, ± angular stems Leaflets 0.8-1.5 mm wide	Desmanthus

	a	Stamen filaments free Central flower of inflorescence not different from the rest	Acacia
	b	Stamen filaments united basally into a tube, tube included or exserted beyond the corolla Central flower of inflorescence usually differing from and often larger than the rest	Albizia

	a	Leaflets alternate to subopposite, 7-19 mm wide, with petiolules 1.5-3.0 mm long	Amblygonocarpus
	b	Leaflets opposite, very rarely alternate but then sessile and less than 2 mm wide

	a	Stamens 10
	b	Stamens many to numerous (± 19-200)

	a	Leaf rachis with a gland at the junction of each pair of pinnae or the upper pairs Large tree	Newtonia
	b	Leaf rachis eglandular Liane, climber, shrub, suffrutex or small tree

	a	Liane, climber or erect suffrutex, the latter with leaflets 7-20 mm wide	Entada
	b	Suffrutex, shrub or small tree Leaflets less than 6.5 mm wide	Elephantorrhiza

	a	Stamen filaments free	Acacia
	b	Stamen filaments united basally into a tube, tube included or scarcely exserted beyond the corolla Flowers uniform	*Paraserianthes

	a	Leaves simple, emarginate apically to deeply bilobed, sometimes with a pair of leaflets
	b	Leaves pinnately or bipinnately compound with more than 2 leaflets, very seldom leaves reduced to green, ± terete, 'needle-like' pinna-rachillae with or without minute inconspicuous leaflets, or the rachillae laterally winged and appearing flattened, '± phyllodial', with many pairs of small leaflets

	a	Petals 0 Leaves with a single pair of leaflets
	b	Petals 5 Leaves emarginate apically to deeply bilobed, occasionally with a single pair of leaflets

	a	Stamens (8-)10(-12) Inflorescence an axillary or terminal panicle Leaflets with a midrib and lateral nerves or without a midrib but with 3-6 conspicuous nerves arising from the base Pods pale yellowish brown, reniform, indehiscent Seeds with small sticky reddish resin glands	Colophospermum
	b	Stamens 20-25 Inflorescence a slender raceme or panicle Leaflets with 7-12 prominent nerves arising from the base, without a midrib Pods brown or reddish brown, obliquely semiorbicular, ovate or ovate-oblong, dehiscent or indehiscent Seeds not as above	Guibourtia

	a	Plants with trailing or climbing, mostly herbaceous stems arising from a large underground tuber Tendrils usually present Fertile stamens 2, accompanied by staminodes Calyx with the 2 upper sepals partly or completely fused, the rest free	Tylosema
	b	Plants growing as a shrub or small tree, seldom scandent or climbing but then woody and without tendrils

	a	Flowers normally unisexual and plants dioecious Female flowers with the stigma sessile on the ovary, capitate, flattened-globose Male flowers with 10 fertile stamens Calyx turbinate with 4 or 5 short broad lobes	Piliostigma
	b	Flowers bisexual Style elongate Fertile stamens 1-10 Calyx spathaceous or campanulate with 5 short lobes or teeth

	a	Calyx spathaceous, splitting to the base down one side only, with the sepals fused or sometimes partly separated Fertile stamens 1-10, sometimes accompanied by staminodes Pods oblong or oblanceolate-oblong, valves thinly woody	Bauhinia
	b	Calyx campanulate, with 5 short teeth or lobes Fertile stamens 10 Plants often conspicuously glandular Pods semiorbicular, valves papery, with or without stalked glands	Adenolobus

	a	Leaves reduced, the pinna-rachillae green, ± terete and 'needle-like', with or without minute inconspicuous leaflets, or the rachillae laterally winged and appearing flattened, '± phyllodial', with many pairs of leaflets up to 9 x 3 mm Plant armed with stout spines	Parkinsonia
	b	Leaves not reduced, pinna-rachillae not 'needle-like' or '± phyllodial' Plant unarmed or armed with recurved prickles, rarely armed with spines

	a	Leaves bipinnate
	b	Leaves simply pinnate

	a	Plant unarmed
	b	Plant armed with prickles or spines

	a	Leaflets alternate Flowers small (petals 2-5 mm long, white to cream-coloured or pale green) Sepals open from a very early stage, leaving the petals covering the flower until anthesis
	b	Leaflets opposite Flowers usually medium to large (petals 7-32 mm long, seldom smaller, yellow, orange, red or magenta) Sepals valvate or imbricate

	a	Flowers pedicellate With narrow petals which are ± densely pubescent, at least on the margins Anthers 0.5-0.75 mm long Stigma minute, cup-shaped-punctiform on a narrow conical style Stamen filaments pubescent or tomentose to near the apex Hairs (when present) on vegetative buds and young branchlets grey-brown to yellowish	Erythrophleum
	b	Flowers sessile Petals glabrous or almost so Anthers 1.5-2.0 mm long Style very short, ending in a funnel-shaped stigma slit down one side Stamen filaments glabrous Hairs on vegetative buds, young branchlets and inflorescence axes rusty red	Burkea

	a	Leaves imparipinnate Herb or low shrub up to 0.5 m high Stems, leaves and calyces with many dark sessile glands Petals up to 9 mm long	Hoffmannseggia
	b	Leaves paripinnate Tree or large shrub Petals 7-32 mm long

	a	Stigma broadly peltate Inflorescence axes, calyces and ovaries rusty tomentose Petals yellow Stipules up to 14 mm long, linear-subulate with up to 7 linear, alternate lateral appendages up to 6 mm long	Peltophorum
	b	Stigma not broadly peltate Inflorescence axes, calyces and ovaries not rusty tomentose Petals yellow, pink, red or magenta Stipules not as above	Caesalpinia

	a	Calyx lobes valvate Flowers small, greenish to white Spines usually branched	*Gleditsia
	b	Calyx lobes or teeth imbricate Flowers yellow, pale yellowish white, pink, red or magenta Spines not branched

	a	Petals 2-3 mm long Pods samaroid, with a basal seed-containing portion whose upper suture is greatly extended beyond the seed-containing part and is broadly winged on its lower side	Pterolobium
	b	Petals 6-25 mm long Pods unwinged	Caesalpinia

	a	Plants armed with spines
	b	Plant unarmed

	a	Leaves with 3 pairs of opposite leaflets Inflorescence a relatively few-flowered lateral or terminal raceme Petals yellow, 8-10 x 5-7 mm Ovary glandular	Haematoxylum
	b	Leaves with (3-)5-10(-12) pairs of subopposite or irregularly alternate leaflets Inflorescence a short, lax panicle or many-flowered, drooping raceme Petals greenish or white Ovary eglandular

	a	Inflorescence a lax panicle Pods 30-50 mm long, 9-12 mm wide, straight or almost so, dehiscent	Umtiza
	b	Inflorescence a dense drooping raceme Pods large, 150-300 mm long, 25-35 mm wide, usually slightly falcate but often twisting with age, indehiscent	*Gleditsia

	a	Bracteoles paired, valvate throughout, well developed, completely enclosing the flower bud, usually persistent
	b	Bracteoles nonvalvate, often scale-like, often caducous or 0, seldom enclosing the flower bud, but, if so, then one or both margins of one bracteole overlapping the other, at least at the base, and the flower with only 1 petal

	a	Bracteoles enclosing the young flower bud but soon caducous, exposing the bud enclosed by the calyx Stamen- and staminode filaments all united basally for ± half their length Fertile stamens 3, alternating with 5 sterile teeth or short filaments Larger petals 3, subequal, gold with red veins	Tamarindus
	b	Bracteoles enclosing the young flower bud and persistent below the open flower Stamens not as above and more than 3 fertile Petals or tepals not coloured as above

	a	Perianth clearly differentiated into 5 obvious petals and 5 sepals	Julbernardia
	b	Perianth 0 or of 1-7(-11) parts, usually 4-7 all sepaloid and of similar form, grading inwards from broader to narrower	Brachystegia

	a	Petals 0 or sometimes petals present but reduced to minute, linear, inconspicuous filaments and apparently absent
	b	Petals 1-5, well developed

	a	Stamens 10, filaments united basally for 1.5-3.5 mm, tube entire or split down one side Calyx leathery, 4-(rarely 5-)lobed, red or scarlet, glabrous or sparingly puberulous Ovary glabrous Inflorescence a dense, congested, subglobose panicle, usually cauliflorous on older branches but occasionally terminal	Schotia
	b	Stamens 5-10, filaments free Sepals 5, fulvous or rusty brown puberulous outside Ovary densely ferruginous-hirsute Inflorescence a many-flowered panicle or raceme

	a	Inflorescence a many-flowered panicle Ovules 2 Pod ovoid-ellipsoid, densely brown velutinous-puberulous	Dialium
	b	Inflorescence a dense raceme Ovules many Pod elongated, compressed, thick and coriaceous, glabrous	*Ceratonia

	a	Petals 1-4
	b	Petals 5

	a	Petals 1, pubescent and green outside, dark red inside, 25-45 mm long, with a long claw suddenly widening into a deeply bilobed lamina 22-31 mm wide Fertile stamens usually 7 (rarely 9)	Afzelia
	b	Petals 1-4, pale pink or red throughout, smaller than above and not widened above into a deeply bilobed lamina Fertile stamens 10	Schotia

	a	Anthers opening by terminal or basal pores or short slits, usually basifixed Petals mostly yellow Glands often present on petiole or leaf rachis
	b	Anthers opening by longitudinal slits which are as long as the anther, usually dorsifixed Petals pink, red, mauve, magenta or sometimes yellow Conspicuous glands not present on petiole or rachis

	a	Filaments of the 3 adaxial stamens sigmoidally incurved, many times longer than their small anther Filaments of other stamens straight, shorter, the anthers dehiscing by basal pores Pedicels 2-bracteolate at or just above their base Pod elongate, usually cylindric, indehiscent Seed coat smooth, without areoles Tree	Cassia
	b	Filaments of all stamens straight, either shorter or not more than twice as long as their anthers, if longer, then the anthers dehiscing by apical pores Pods various, but if cylindric and indehiscent then the pedicels without bracts

	a	Bracteoles 0 Pod either indehiscent, or breaking inelastically through one or both sutures, if through both, then the valves not coiling Androecium often irregular, the members tending to decrease in size from the abaxial to the adaxial side of the flower Anther thecae naked along the sutures Seed coat often with a closed areole on each face or margins Tree, shrub or herb	Senna
	b	Bracteoles 2 Pod elastically indehiscent, the valves coiling at or after dehiscence Androecium virtually regular, the two cycles sometimes of different lengths but not decreasing regularly from abaxial to adaxial side of the flower Anther thecae ciliolate along the sutures Seed-coat without areoles Usually a herb	Chamaecrista

	a	Petals yellow Small shrub to 2 m high Leaves up 12 mm long with 3 pairs of obcordate or broadly obovate to obovate-suborbicular leaflets	Haematoxylum
	b	Petals pink, red, mauve or magenta Large shrub or tree Leaves much larger than above

	a	Inflorescence a short raceme or panicle Calyx glabrous or almost so Petals pink, red or scarlet Ovary glabrous or almost so	Schotia
	b	Inflorescence a stout raceme up to 350 mm long Sepals densely fulvous-tomentose outside Petals pink, mauve or magenta Ovary fulvous-tomentose	Baikiaea

	a	Filaments all free from base upwards, occasionally shortly and ± equally connate at base only Anthers usually uniform in size and shape
	b	Filaments partly or almost wholly united to one another, either monadelphous in a closed tube, or diadelphous with the vexillary (adaxial) filament often free or partly so

	a	Calyx lobes apparent or corolla markedly papilionoid Stamens (5-)10(-30) Petals generally 5, rarely 1 or 0
	b	Calyx entire in bud Stamens 9-numerous Petals 0-9, not much differentiated

	a	Leaves digitately foliolate or simple, very rarely pinnate or reduced to scales
	b	Leaves pinnately foliolate or of only 1 leaflet and then with distinct pulvinus at apex of petiolule

	a	Anthers distinctly dimorphic, alternately basifixed and shorter dorsifixed Leaves simple, 1-foliolate or digitately 3(-many)-foliolate, if compound, leaves generally pulvinate or with a raised leaf base, rarely distichous, never glandular-punctate Fruit never jointed
	b	Anthers ± uniform at least in size, some sometimes aborted, or if dimorphic (in Aeschynomeneae, Psoraleeae and a few Phaseoleae, by abortion in Teramnus) then leaves pinnate or glandular punctate

	a	Calyx lobes variously united, but not as below, or subequally lobed Lowermost lobe often much shorter and narrower than upper ones Flowers in terminal, rarely leaf-opposed, spikes, racemes, or heads, rarely axillary Seeds rarely arillate
	b	Upper 2 calyx lobes joined higher than lower ones, sometimes enlarged Lowermost (carinal) calyx lobe generally longer or narrower than upper ones Flowers mostly in heads or clusters Style glabrous Seeds arillate

	a	Filaments fused into a sheath open on upper side
	b	Filaments fused into a closed tube

	a	Leaves with pulvinus 0 (stipules often adnate to petiole base) or reduced, often with a stipular ridge forming an abaxial commissure, generally distichous or crowded Inflorescence axillary Herb or small softly woody shrub
	b	Leaves pulvinate, mostly free from stipules if present

	a	Leaves not toothed (except some Psoraleeae) Nerves looped within the margin (except some Galegeae)
	b	Leaflets ± toothed Nerves extending to ± toothed margin of leaflets Stipules adnate to petiole base

	a	Leaves generally paripinnate, ending in a tendril or bristle, rarely imparipinnate Stipules free from petiole, generally foliaceous Fruit 2-valved Seeds lenticular to globose with ± linear hilum and no radicular lobes Herb	*Vicia
	b	Leaves generally ending in a leaflet or a spine, less often in a bristle Stipules generally small and/or adnate to the petiole Seeds with a small round hilum generally below a radicular lobe

	a	Filaments of all or alternate stamens dilated apically Flowers 1 or 2 from axils, in heads or more often umbellate, sometimes subtended by a foliar bract Compound leaves generally with at least 3 terminal leaflets conjugate, lowermost pair sometimes stipule-like, sometimes with a glandular stipule
	b	Filaments not dilated upwards

	a	Fruit not jointed, generally dehiscent if long-exserted	Lotus
	b	Fruit jointed or elongated with thickened margins and hooked tip	*Ornithopus

	a	Ovules 2-many Fruit not both 1-seeded and glandular Racemes or fascicles simple with flower bracts only
	b	Ovule 1 Fruit 1-seeded, glandular Inflorescences compound, with more than 1 series of bracts Foliage ± glandular-punctate or pustulate

	a	Petals differentiated, papilionoid
	b	Petals 5, all similar, ribbon-like or spathulate Fruit drupaceous or flat and curved, eglandular 1(-2)-seeded, indehiscent

	a	Stamens 9 Leaves paripinnate Flowers in pseudoracemes (pedicels several at a rachis node) or axillary fascicles Pods elastically dehiscent, with brown to brightly coloured seeds	Abrus
	b	Not as above

	a	Anthers not appendaged (if petals caducous)
	b	Anthers apiculate or appendaged Petals usually reddish and caducous Biramous hairs present (often among others) Normally leafy

	a	Anther thecae separate, sometimes reduced to terminal pores (then plant woody)
	b	Anther thecae confluent above Perennial herb with astragaloid flowers, ± glandular foliage and minute peltate scales Fruit several-seeded, dehiscent or not, often muricate or bristly

	a	Fruit more pod-like, eglandular or woody Glands, if present, generally on surface or small internal punctae
	b	Fruit 1-seeded, often nutlet-like, small, generally glandular, with marcesent calyx Foliage glandular-pustulate or -punctate Never twining or large tree Inflorescence axillary Leaves (1-)3(-5)-foliolate

	a	Fruit not jointed, or if so (Aeschynomeneae), seeds more symmetrical Lower petals more retractible or little interconnected and differentiated
	b	Fruit transversely jointed, sometimes of only 1 article, or less often opening down one suture (then tertiary venation of leaflets scalariform) Seeds with radicular lobe longer than cotyledonary lobe Lower petals generally withering and caducous after explosive pollen release Inflorescence generally compound with more than 1 series of bracts Leaves pinnately 3(-11)-foliolate, generally stipellate Stipules and bracts often striately nerved

	a	Style curved towards standard
	b	Style straight or curved away from standard Standard with a median gutter Leaves digitately 3-foliolate

	a	Hypanthium 0 Intrastaminal disc generally present Vexillary filament often connate medially, but free, arched and thickened to form openings at base Flowers generally in pseudoracemes, sometimes in extensive panicles or clustered in axils Leaves generally imparipinnate, 3-many-foliolate, leaflets generally strictly opposite and stipellate, occasionally alternate, sometimes 1-foliolate or simple
	b	Hypanthium present, short to long Intrastaminal disc generally lacking Vexillary filament not flared at base of staminal tube Flowers almost always arising singly if inflorescence extended Leaves variously paripinnate to imparipinnate Leaflets alternate to opposite, with or without stipels, sometimes 1-3-foliolate

	a	Leaves (1-)3-foliolate, the laterals usually markedly asymmetrical and regularly stipellate, occasionally 5-9-foliolate Twining prostrate or erect herb, sometimes a shrub, liane or tree Inflorescences often in many axils
	b	Leaves 1-many-foliolate, if 3-foliolate the lateral leaflets only slightly asymmetrical Tree, shrub or liane with hard wood, less often a subshrub or herb (Tephrosia generally have closely parallel nerves extending to leaflet margins, but easily confused with Phaseoleae subtribe Ophrestiinae) Inflorescences aggregated towards branch ends

	a	Fruit not jointed, nor geocarpic
	b	Fruit jointed or geocarpic

	a	Ovules generally more numerous Fruit generally more pod-like even if flat and indehiscent
	b	Ovules 1-4 Fruit indehiscent, the seeds generally in separate seed chambers with hard endocarp Keel petals generally overlapping abaxially or, if margins adnate, flowers usually secund on the rachis, ± free from wings Stamens often shortly and/or irregularly joined

	a	Flowers in axillary racemes (occasionally with 1 or 2 branches if on leafless shoots) or rarely strictly leaf-opposed or in axillary clusters Keel petals abaxially joined (shortly in some bird-flowers) Stamens three-quarters joined except some bird-flowers Pods usually dehiscent, often septate internally
	b	Flowers in terminal panicles, sometimes with supplementary axillary racemes, rarely all axillary Stamens very rarely joined so high and keel petals usually overlapping abaxially Fruit generally indehiscent	and 159

	a	Conspicuous pellucid or pustular glands on leaves, calyx, etc. or, if obscure, flowers sessile in many paired bracts Pedicels without joints or bracteoles Fruit without strong longitudinal nerves on sides Articles several, quadrate, often ornamented with glands, crests or bristles	Zornia
	b	Pellucid or pustular glands lacking Pedicels almost always articulate and/or bracteolate

	a	Flowers pedicellate Receptacle broader than long or 0 Ovary generally stipitate
	b	Flowers sessile or subsessile in axils or on a common axis (bracts and 2 bracteoles then adjacent) Receptacle longer than broad, sometimes tubular Ovary sessile or nearly so Fruit with strong continuous longitudinal nerves on sides

	a	Leaves almost always imparipinnate Fruit (unless globular or covered by bristles) with strong continuous nerves on sides Ovary septa formed late 3 lower calyx lobes discrete Stamens variously united but tending to split on vexillary side first, deflexed after anthesis	Ormocarpum
	b	Leaves paripinnate, subimparipinnate or occasionally imparipinnate Articles reticulately veined Ovary septa generally formed by anthesis 3 lower calyx lobes discrete or largely joined in a lip Stamens tending to split on carinal side first, usually 10 or 5 + 5, usually lying above the fruit

	a	Fruit exserted from the calyx	Aeschynomene
	b	Fruit enclosed within the calyx

	a	Stipules spurred at base Spur bilobed, with one side linear and longer than the other Leaflets opposite, 1-nerved	Smithia
	b	Stipules not spurred at base Leaflets alternate, with 2-7 basal nerves	Kotschya

	a	Leaflets 3 Fruit not maturing below the soil Petals arising in throat of calyx tube	Stylosanthes
	b	Leaflets 2 or 4 Fruit maturing below the soil, reticulate Petals and stamens arising at the apex of the calyx tube	*Arachis

059	a	Stipules 0 or inconspicuous Anthers often dimorphic
	b	Stipules conspicuous, free from each other and from leaf

	a	Leaves simple
	b	Leaves compound, rarely reduced to a single leaflet

	a	Calyx lobes subequal Leaves with 3-several parallel nerves Vexillum villous Fruit linear, compressed Shrub or shrublet, glabrous or sparsely villous	Aspalathus
	b	Calyx lobes unequal, the lower smaller and narrower than the upper Leaves usually with 1 main nerve and several lateral nerves

	a	Fruit lanceolate or linear Shrub or shrublet, ± glabrous and often glaucous Leaves from orbicular to linear, sessile or subsessile	Rafnia
	b	Fruit ovate, turgid Perennial herb, villous Stems prostrate from a woody rootstock Leaves lanceolate	Lotononis

	a	Calyx ± regularly 5-toothed
	b	Calyx not regularly 5-toothed

	a	Fruit linear Leaves petiolate, 3-foliolate or simple or reduced to scales	Lebeckia
	b	Fruit semi-ovate or lanceolate, obliquely acute or obliquely rhomboid Leaves in threes or fascicles, not petiolate	Aspalathus

	a	Calyx with 4 upper lobes ± united in pairs, the lowest free Anthers dimorphic
	b	Calyx 2-lipped

	a	Keel and style curved Mostly a shrublet	Lotononis
	b	Keel and style straight Mostly a herb	Pearsonia

	a	Calyx with trifid lower lip (lateral sinuses deeper than the lower ones) Fruit subtorulose, linear, flat Keel longer than the vexillum	Dichilus
	b	Calyx without trifid lower lip (lateral sinuses may be wider than the lower ones, but not deeper) Fruit winged along the upper or both sutures, flat and indehiscent, ovate or oblong	Wiborgia

	a	Stipules fused with the petiole and forming a cylindrical sheath around the stem	Polhillia
	b	Stipules not sheathing the stem

	a	Calyx equally 5-toothed or -lobed
	b	Calyx not equally 5-toothed or -lobed

	a	Anthers uniform, all bearing anthers Leaves digitately 3-foliolate or only the upper 1-foliolate	Rothia
	b	Anthers alternately longer (basifixed) and shorter (dorsifixed)

	a	Stipules small Flowers in terminal, often unilateral racemes Fruit linear	Lebeckia
	b	Stipules conspicuous, sometimes foliaceous and toothed Peduncles leaf-opposed

	a	Beak of keel not spirally coiled	Crotalaria
	b	Beak of keel and genitalia spirally coiled	Bolusia

	a	Calyx with the 4 upper teeth ± united in pairs, the lower one free	Lotononis
	b	Calyx bilabiate Anthers alternately dissimilar Fruit linear, compressed, often tortulose	Melolobium

062	a	Wing petals not much broader than keel, not crimped, white or cream-coloured Anthers basifixed, with apical dehiscence Some branches modified as spines or climbing aids	Dalbergia
	b	Wing petals broadly expanded, ± crimped, bright yellow or orange-yellow Anthers dorsifixed with longitudinal dehiscence Branches not modified as spines or climbing aids	Pterocarpus

	a	Plants without uncinate hairs Tertiary venation reticulate Stipels 0 Flowers chasmogamous, not explosively dehiscent, often mixed with cleistogamous flowers Vexillum with inflexed auricles more persistent than most Desmodiinae Ovary 1-ovulate	*Lespedeza
	b	Plants with characteristic uncinate hairs Tertiary venation ± scalariform Stipels present Flowers chasmogamous, with an explosively dehiscent pollination mechanism Vexillum with hardly or slightly inflexed auricles Ovary (1)-many-ovulate

	a	Calyx glumaceous, striate, deeply divided, persistent and often partially enclosing the fruit Fruit held erect, usually consisting of a number of 'stacked' terete or subterete articles Leaves 1-foliolate	Alysicarpus
	b	Calyx often membranous, not glumaceous or striate, shallowly divided, usually inconspicuous in fruit Fruit mostly held away from erect Leaves (1)3(5)-foliolate

	a	Stipules stramineous, striate, erect or spreading but never sharply recurved and velutinous Fruit distinctly jointed, breaking up into individual articles	Desmodium
	b	Stipules mostly sharply recurved, dark brown adaxially, silver-velutinous abaxially Fruit splitting into 2 valves	Pseudarthria

062	a	Style glabrous, but stigma sometimes penicillate (short, uniform hairs all round) Pods not as below
	b	Style bearded (sometimes just a tuft of hairs below stigma on one side) Claws of keel largely joined Pods generally inflated (sometimes bladdery), if compressed, generally membranous, with sutures intruding or not, but without a longitudinal septum

	a	Pod nerves oblique, closely parallel, raised at maturity, confluent towards placental margin Vexillary filament connate with others Keel blades not auriculate Leaflet nerves extending to margin	*Glycyrrhiza
	b	Pod nerves transverse, confluent over middle part of valves, fine or inconspicuous Vexillary filament generally free Keel blades generally auriculate Leaflet nerves usually looped within the margin or inconspicuous

	a	Perennial herb Unarmed Leaflets many	Astragalus
	b	Rigid much-branched shrub Armed with axillary spines Leaves 1-foliolate	*Alhagi

	a	Style bearded with hairs on the upper (adaxial) face Fruit membranous-bladdery, inflated	Sutherlandia
	b	Style bearded around the stigma Fruit membranous, slightly inflated or compressed	Lessertia

	a	Leaves 5-17-foliolate, palmate, or leaves simple and large (most over 30 × 10 mm) Keel strongly beaked Wings generally adnate at apex	*Lupinus
	b	Leaves 1-3-foliolate or leaves simple and smaller Keel obtuse, rarely slightly beaked Wings free at apex

	a	Plant spiny	*Ulex
	b	Plant not spiny

	a	Leaves simple or 1-foliolate, sometimes very small
	b	Leaves 3-foliolate

	a	Calyx split to the base adaxially	*Spartium
	b	Calyx not split to the base	*Cytisus

	a	Calyx nearly as long as the keel Plant often herbaceous	Argyrolobium
	b	Calyx with short teeth and not as long as keel Plant always a shrub	*Cytisus

	a	Pods 3-5 mm wide, erect, longitudinally ridged Leaflets often dentate Vexillary (adaxial) stamen completely united with others into a closed tube Corolla darkly veined when dry	Cyamopsis
	b	Pods less than 3 mm wide, erect, patent or reflexed, not as above Leaflets never dentate Vexillary (adaxial) stamen free from others or united with them only at base Corolla not darkly veined when dry

	a	Keel (and usually dorsal surface of standard) hairy Upper margin of the keel with a fringe of hairs Standard mostly broad at the base, tapering suddenly to a short claw Keel with lateral spurs, not prolonged-rostrate at the apex	Indigofera
	b	Keel (and usually dorsal surface of standard) glabrous Standard narrow at the base, tapering gradually to the claw Keel with lateral pockets (spurs 0), often prolonged-rostrate at the apex

	a	Style short, thick Stigma discoid Fruiting pedicels mostly over 2 mm long, ± patent Pods often held at ± a right angle Bracts persistentI Inflorescence lax in bud	Microcharis
	b	Style narrow, tapering to an oblique or capitate stigma Fruiting pedicels rarely over 2 mm long, reflexed (as are pods) Bracts caducous Inflorescence dense in bud	Indigastrum

	a	Leaves digitately 3-foliolate Stamens in a closed tube Bracteoles present	Hypocalyptus
	b	Leaves simple Stamens in an open sheath Bracteoles 0

	a	Keel petals not laterally appendaged Flowers mostly yellow Anthers ± equal in length Flowers in terminal heads or clusters
	b	Keel petals gibbous on one side or with spur Anthers dimorphic Flowers small

	a	Calyx lobes unequal, lowest petaloid and large Keel narrow, slightly falcate, with a forwardly directed beak Leaves completely sessile	Liparia
	b	Calyx lobes subequal, not petaloid Keel obtuse or with an upwardly directed beak Leaves with a short petiole	Xiphotheca

	a	Vexillary stamen free, joined part of the stamen usually longer than the free part	Amphithalea
	b	Vexillary stamen joined with others, the free part usually longer than the joined part	Coelidium

	a	Leaflets and calyx eglandular
	b	Leaflets and calyx generally with yellowish gland-dots Bracteoles 0 Style slender below, hardened and a little thickened distally, glabrous Inflorescence not nodose

	a	Style generally terete and unbearded (sometimes a few hairs below the stigma), occasionally coiled in Erythrininae, sometimes bearded or flattened in Clitoriinae but then petals less complex Hila rarely covered with tissue
	b	Style with distinctive expansion, flattening, coiling or specialised hairs, or if rarely unbearded as well as terete then petals elaborate with appendages on standard and keel petals adaxially joined Hila usually covered with spongy tissue

	a	Flowers generally resupinate Calyx naked inside Style narrow or expanded to naked, penicillate or bearded in distal part Petals often hairy Leaflets 3, 1 or 5-9, with minute hooked hairs	*Clitoria
	b	Flowers not resupinate or, if so, then differing in other respects

	a	Standard silky hairy outside, rather small, without appendages inside Seeds smooth, with a prominent aril Inflorescence not or slightly nodose	Ophrestia
	b	Standard glabrous, or if hairy then inflorescence generally nodose or flowers much modified

	a	Flowers mostly adapted to pollination by bees or, if bird-flowers, then petals subequal in length
	b	Flowers mostly adapted to pollination by birds or bats, the petals generally unequal in length, the fertile parts loosely housed or exserted, sometimes with small bee-type flowers but then either style coiled or flowers in extensive panicles and pod samaroid

	a	Inflorescence generally nodose, occasionally paniculate or axillary and few-flowered Seeds diverse, with short to long hilum
	b	Inflorescence not or scarcely nodose (sometimes branched in Pueraria) Seeds smooth, granular or rough, with short hilum

	a	Ovules 4 or more Arils often prominent
	b	Ovules 2, rarely 3 Arils usually inconspicuous

	a	Fruit ± compressed, acuminate, marked between the seeds with oblique, depressed lines	*Cajanus
	b	Fruit turgid, without depressions	Bolusafra

	a	Calyx lobes enlarged and membranous or scarious after flowering, the lowest largest Sruit falcate-ovate, enclosed by the calyx	Rhynchosia
	b	Calyx lobes not enlarged after flowering

	a	Fruit turgid Leaves digitately 3-foliolate or 1-foliolate Flowers spicate-racemose or paniculate	Flemingia
	b	Fruit compressed Flowers usually several in racemes

	a	Stems usually twining or trailing Funicle of the seed attached in the middle of the hilum	Rhynchosia
	b	Stems usually stiff and erect Funicle of the seed attached at the end of the linear hilum	Eriosema

	a	Calyx not strongly 2-lipped Upper calyx lobes completely united (calyx appears 4-lobed) Fruit narrowly linear, straight or curved, many-seeded Usually a herb or subshrub, prostrate, climbing or erect	Galactia
	b	Calyx 2-lipped, the upper lip large, entire or 2-lobed, the lower lip small Fruit large, linear-oblong to oblong, usually with longitudinal ribs close to upper margin Usually a woody climber or liane	Canavalia

	a	Carina shorter than vexillum Anthers uniform Fruit glabrescent, often moniliform Stipels glandular or, rarely, coriaceous Usually a tree or shrub	Erythrina
	b	Carina exceeding vexillum Anthers alternately dorsifixed and basifixed, the shorter often bearded Fruit with indumentum of irritant hairs Stipels nonglandular Woody liane or climber	Mucuna

	a	Stamens alternately aborted Persistent style of the fruit turned up into a hook	Teramnus
	b	Stamens all fertile Pod without a hook

	a	Claws of the wings and keel longer than the blade Seeds with a smooth surface without a scarious flap Calyx thin and glabrous on the inside, translucent Upper calyx lobes united	Dumasia
	b	Claw of the wings and keel shorter than the blade Seeds usually with a rough surface Hilum often with a scarious flap Calyx lobes often distinct

	a	Vexillary stamen usually united with the others Flowers small, white Inflorescence lax, 20-150-flowered Upper calyx teeth united	Neonotonia
	b	Vexillary stamen free below but connate above with the rest Flowers usually purple Inflorescence elongate, with the groups of flowers arising from very conspicuous nodes Upper calyx teeth distinct	*Pueraria

	a	Stigma lateral, oblique Style filiform, coiled with 3-5 or more revolutions	Vigna
	b	Stigma terminal

	a	Stigma bilabiate Stamens monadelphous	Otoptera
	b	Stigma not bilabiate Adaxial stamen usually free

	a	Pollen grains tuberculate or spinulose, zonitriporate Style tenuous throughout or slightly widened above Standard with narrow, elongated appendages Wings very narrow, flowers mostly yellow or orange Ovary 3-9-ovulate	Macrotyloma
	b	Pollen grains not spinulose or, if somewhat granulate, then other characters not as above Flowers often shades of red, violet, purple or blue

	a	Style not narrowed into a thin waist
	b	Style of two parts, an upper, incrassated part and a basal, tenuous part

	a	Style conspicuously flattened throughout and blade-like, slightly less than at right angles to the ovary Staminal appendages 2
	b	Style not conspicuously flattened throughout

	a	Style 2-winged, glabrous Stigma ± penicillate Keel somewhat rounded	Alistilus
	b	Style not winged, with a line of hairs along inner margin Stigma not penicillate Keel sharply angled in middle Pods usually verrucose along margins	Lablab

	a	Style with apex flattened into a tenuous, spatulate portion, stigmatose along the terminal edge	Sphenostylis
	b	Style not flattened (except in Dolichos junodii)

	a	Style strongly curved near base and apex in same direction, the middle part gently curved in opposite direction	Dipogon
	b	Style not so complicatedly curved

	a	Style with a distinct, bulging, eccentric callus at its junction with the ovary	Neorautanenia
	b	Style without prominent callus at junction with ovary Stigma terminal, usually ringed with hairs	Dolichos

	a	Keel not so strongly curved Stigma terminal, scarcely penicillate Flowers on a nodulate rachis	Dolichos
	b	Keel incurved through 180-360° Stigma terminal, penicillate, with simple or branched hairs Flowers in axillary fascicles, usually precocious	Decorsea

	a	Leaflets many Flowers in extended racemes	Virgilia
	b	Leaflets 1-3 Flowers 1 or 2(-4)

	a	Leaves digitately or palmately 3-foliolate Calyx lobes longer than tube, imbricate Flowers solitary, axillary Wings with a transverse fold Fruit oblong, compressed	Cyclopia
	b	Leaves simple or unifoliolate Calyx lobes longer than tube Flowers 1-2(3-4)-nate on axillary peduncles Wings with curved, linear claw Fruit ovoid or oblong

	a	Flowers purple, pink or white Style base glabrous	Podalyria
	b	Flowers yellow Style base pubescent	Stirtonanthus

062	a	Flower pedicel subtended by a distinctive, lobed cupulum
	b	Flower pedicel never subtended by a distinctive, lobed cupulum

	a	Calyx lobes covered with black stubby hairs on inner surface, tube prominently ribbed and encrusted with glands Internal secretory cavities present in leaflets	Psoralea
	b	Calyx lobes not covered with black stubby hairs on inner surface, tube weakly ribbed and sparsely glandular Internal secretory cavities 0 in leaflets	Hallia

	a	Fruit ovoid, with conspicuous black glandular warts when mature	Cullen
	b	Fruit never with black glandular warts	Otholobium

	a	Hard-wooded tree and shrub Stipules spinescent, usually paired Seeds not in distinct compartments	*Robinia
	b	Upright herb, rarely tall and subshrubby Stipules not spinescent Fruit septate	Sesbania

056	a	Leaves reduced to 1 leaflet (unifoliolate) Fruit linear or falcate	Baphia
	b	Leaves with 2 or more leaflets

	a	Fruit or pod moniliform, stalked Flowers white, yellow or rarely blue-violet, in racemes or leafy panicles	Sophora
	b	Fruit not moniliform

	a	Fruit broadly linear, ± winged or margined Flowers yellow	Calpurnia
	b	Fruit not winged Flowers mainly blue and pink

	a	Vexillum much broader than other petals Racemes simple, pendulous Flowers blue Fruit linear to oblong, compressed	Bolusanthus
	b	Vexillum only slightly broader than other petals Racemes paniculate Fruit stalked, drupe-like	Xanthocercis

	a	Petals 0 Leaflets (7)11-28 per leaf, with many pellucid glands Stamen filaments confluent basally with the hypanthium (calyx tube)	Cordyla
	b	Petals 1, large Leaflets (3)5-11 per leaf, without pellucid glands Stamen filaments free or nearly so Disc and hypanthium 0 (filaments arising around base of gynophore or ovary)	Swartzia

075	a	Herb or undershrub, never scandent
	b	Robust shrub or tree, sometimes scandent

	a	Legume contorted, membranous, subindehiscent Leaves digitately foliolate Stipules small or 0 Flowers 2 or 3 in leaf axils	Ptycholobium
	b	Legume coriaceous or rigid

	a	Legume 2-few-seeded Leaves usually pinnately trifoliolate	Tephrosia
	b	Legume 1-seeded Leaves unifoliolate Leaflet obcordate	Requienia

	a	Leaves imparipinnate, stipulate Leaflets opposite
	b	Leaves imparipinnate, stipulate Leaflets alternate or subopposite

	a	Leaflets stipellate	Millettia
	b	Leaflets not stipellate

	a	Fruit winged along the upper or both sutures Calyx truncate or with very short or obsolete teeth	Derris
	b	Fruit not winged, flat and compressed, membranous or coriaceous

	a	Flowers white, pink or purple, in dense panicles, with most flowers reaching maturity	Lonchocarpus
	b	Flowers orange, in terminal pseudoracemes, with only one flower per node reaching maturity	Tephrosia

	a	Fruit woody, soon dehiscent	Craibia
	b	Fruit coriaceous or membranous, never woody, indehiscent or tardily dehiscent

	a	Wing petals free from keel Keel petals free from each other Flowers in terminal panicles Fruit margined with a wing on each side	Xeroderris
	b	Wing petals adnate to keel

	a	Leaves sometimes only pinnately 3-foliolate or rarely 1-foliolate Fruit broadly ovate to linear-oblong	Lonchocarpus
	b	Leaves with 6 pairs of leaflets, silvery pubescent Fruit linear	Mundulea

	a	Petals becoming dry and persistent after flowering Filaments mostly dilated upwards Fruit indehiscent	Trifolium
	b	Petals falling after flowering Filaments not dilated

	a	Flowers in slender racemes Ovules few Fruit indehiscent or tardily 2-valved	*Melilotus
	b	Flowers in heads or short racemes or rarely solitary

	a	Fruit straight or curved, mostly linear	Trigonella
	b	Fruit mostly spirally coiled, scarcely dehiscent, mostly prickly	*Medicago