e-Key v3 - Pentzia
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Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Asteraceae - Anthemideae - Pentzia Thunb.

Description :

  • Shrubs or shrublets, cano-pubescent, glandular or glabrous
  • Leaves mostly alternate, rarely opposite, variously pinnatisect, occasionally entire or apically dentate, ± ericoid
  • Capitula discoid, solitary or corymbose, pedunculate, several-flowered
  • Involucre globose; bracts in 3-5 rows, obtuse and with scarious margin
  • Receptacle flat, convex or hemispherical to conical, epaleate
  • Disc florets bisexual, fertile; corolla glandular; tube generally swollen, cylindrical, limb cyathiform-campanulate, with 5 ovate lobes
  • Anthers ecalcarate and ecaudate; with ovate to linear, apical appendage
  • Style terete, sometimes swollen at base; with linear, truncate branches
  • Cypselas yellowish brown, 5-ribbed, ± terete, often with large 2-celled glands and with myxogenic cells abaxially and on ribs
  • Pappus an adaxial auricle, or an oblique adaxially longer cup or of free adaxially whitish scales, sometimes 0
  • x = 6, 7, 8

Nomenclature:

  • Pentzia Thunb.
    • Thunberg: 145 (1800)
    • Harvey: 171 (1865)
    • Hutchinson: 241 (1916)
    • Hilliard & Burtt: 328 (1973)
    • Källersjö: 302 (1988)
    • Bremer & Humphries: 151 (1993)
    • Bremer: 477 (1994)

Distribution & Notes:

  • Global : Species 23, Africa
  • Southern Africa : Species 21, widespread but absent from Mpumalanga, Swaziland and KwaZulu-Natal

References:

  • BREMER, K. 1994. Asteraceae , cladistics & classification . Timber Press, Portland, Oregon
  • BREMER, K. & HUMPHRIES, C. 1993. Generic monograph of the Asteraceae - Anthemideae . Bulletin of the Natural History Museum, Botany Series 23
  • HARVEY, W.H. 1865. Compositae . Flora capensis 3
  • HILLIARD, O.M. & BURTT, B.L. 1973. Notes on some plants of southern Africa chiefly from Natal. Notes from the Royal Botanic Garden Edinburgh 32
  • HUTCHINSON, J. 1916. Notes on African Compositae . Kew Bulletin 1916
  • KÄLLERSJÖ, M. 1988. A generic re-classification of Pentzia Thunb. ( Compositae - Anthemideae ) from southern Africa. Botanical Journal of the Linnean Society 96
  • THUNBERG, C.P. 1800. Syngenesia. Prodromus Plantarum Capensium Pars 2. J. Edman, Uppsala