Leaves
shortly petiolate, mostly glabrous, linear to lanceolate-elliptic or spathulate; truncate or hastate-sagittate at base; basal lobes of blade dentate or entire; apex acute or obtuse to truncate or emarginate, mucronate or tridentate
Inflorescence
cymose, 1-3-flowered
Calyx
subequal or 2 outer sepals larger, oblong to oblong-ovate, acute to subobtuse, occasionally sagittate at base; inner sepals usually lanceolate or lanceolate-acuminate
Corolla
broadly funnel-shaped to campanulate; pale yellow to sometimes white, often with purple to brown centre
Anthers
straight at anthesis; pollen grains pantoporate, smooth
Fruit
ovoid, 4-valved, glabrous or pubescent towards apex
Seeds
1-4, ovoid-trigonous, brown or black, obtuse at apex
Nomenclature:
Xenostegia
D.F.Austin & Staples
Austin & Staples: 533 (1980)
Meeuse & Welman: 63 (2000)
Merremia
Dennst. ex Hallier f. in part
Hallier: 581 (1893)
Distribution & Notes:
Global
: Species 2, Old World tropics
Southern Africa
: Species 1 with 1 subspecies:
Xenostegia tridentata
(L.) D.F.Austin & G.W.Staples subsp.
angustifolia
(Jacq.) A.Meeuse, widespread but absent from Lesotho, Western and Eastern Cape
References:
AUSTIN, D.F. & STAPLES, G.W. 1980.
Xenostegia
, a new genus of
Convolvulaceae
.
Brittonia
32
HALLIER, H. 1893. Versuch einer natürlichen Gliederung der Convolvulaceen auf morphologischer und anatomischer Grundlage.
Botanische Jahrbücher
16
MEEUSE, A.D.J. & WELMAN, W.G. 2000.
Convolvulaceae
.
Flora of southern Africa
28,1
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