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This species is accepted, and its native range is Ethiopia to S. Africa.
A specimen from Kew's Herbarium

[FTEA]

Apocynaceae (part 2), David Goyder, Timothy Harris, Siro Masinde, Ulrich Meve, Johan Venter. Flora of Tropical East Africa, 2012

Morphology General Habit
Robust perennial herb with thick, carrot-like, tuberous rootstock.
Morphology Stem
Stems erect, one to several, (0.2–)0.5–1.5 m tall, unbranched, renewed annually, stout at least at the base, sparsely to densely pubescent with spreading white hairs, the base of the stem often glabrescent
Morphology Leaves
Leaves with petiole 1–5(–10) mm; lamina very variable in shape, linear or linear-lanceolate to ovate or ovate-lanceolate, 7.5–19(–27) cm × 0.5–8.5(–12) cm, apex acute or acuminate, base cordate, somewhat hastate, truncate or broadly rounded, margins crispate, undulate or smooth, often slightly revolute, tips of lateral veins anastomosing to form a wavy submarginal vein, with sparse to dense spreading white hairs, particularly on principal veins and near margins
Morphology Reproductive morphology Inflorescences
Inflorescences umbelliform, 12–26-flowered, densely pubescent.
Morphology Reproductive morphology Inflorescences Peduncles
Peduncles arising laterally from the upper nodes, robust, 12–45(–90) mm long, up to 3 mm thick.
Morphology Reproductive morphology Inflorescences Bracts
Bracts linear, 3–4(–11) mm long.
Morphology Reproductive morphology Flowers Pedicel
Pedicels slender, (8–)14–18 mm
Morphology Reproductive morphology Flowers Calyx
Sepals ovate to lanceolate, 4–8(–11) × 1–2.5 mm, about half as long to as long as the corolla, apex acute or attenuate, pubescent
Morphology Reproductive morphology Flowers Corolla
Corolla cream or greenish white, often tinged with brown or pink outside, divided almost to the base; lobes spreading, ovate, 5–10 × 2.5–6 mm, lower 2/3 glabrous, somewhat concave, upper 1/3 variably pubescent, usually lanate but occasionally glabrous or subglabrous, the apex acute, recurved
Morphology Reproductive morphology Flowers Corona
Corona very fleshy, ± tetrahedral in shape and attached by one of the apices to the base of the gynostegium, or stalk narrow for most of its length and widening abruptly to the ± triangular outer face, the outer face 2–4 × 2–3.5 mm
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium raised on a distinct stalk formed from the anther filaments; stalk 1–3(–4) mm long, usually only partially obscured by the corona lobes but lobes occasionally overlapping base of anthers when gynostegial stalk short
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anther wings jutting out abruptly from column, anthers 2–3 mm tall, appendages membranous, ovate or ± circular, 1–2 mm, rounded or acute.
Morphology Reproductive morphology Flowers Pollinia
Pollinia slender pear-shaped to short club-shaped, 0.75–1.5 mm long, attached by the tip to the translator arm; translator arms narrowly winged in upper part, 0.5–1 mm long; corpusculum dark brown, ovoid, 0.5 × 0.25 mm
Morphology Reproductive morphology Flowers Gynoecium Style
Stylar head ± level with top of anthers, obscured by the anther appendages
Morphology Reproductive morphology Fruits
Fruit a single follicle, 5–8 cm long, 1.5–2.5 cm wide, somewhat inflated or not, lanceolate or ovate in outline with an obtuse or attenuate apex, the entire surface covered with soft hairy prickles
Figures
Fig 109, p 451
Ecology
Fairly common on road or stream banks and in seasonally waterlogged depressions, occasionally in montane grassland; 1000–2400 m
Note
This species is very variable, with distinctive local forms. One such variant occurs around Lake Victoria and has shorter corolla lobes and a less stipitate gynostegium than typical material, and linear-lanceolate leaves. Another small-flowered form is found in the Southern Highlands of Tanzania and the Nyika Plateau of neighbouring Malawi, but the leaves in this variant are much broader.
Distribution
Flora districts: U2 U4 K3 K4 K6 T1 T2 T4 T6 T7 T8 Range: Ethiopia, Angola, Zambia, Malawi, Zimbabwe and South Africa

Native to:

Angola, Botswana, Cape Provinces, Ethiopia, Free State, Kenya, KwaZulu-Natal, Lesotho, Malawi, Namibia, Northern Provinces, Swaziland, Tanzania, Uganda, Zambia, Zimbabwe

Xysmalobium undulatum (L.) W.T.Aiton appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Nov 6, 2007 Pollard, B.J. [1101], Cameroon 75961.000
Milne-Redhead, E. [8160], Tanzania 1087.000
Milne-Redhead, E. [8231], Tanzania 1088.000
Bally, P.R.O. [7928], Kenya 11142.000
Greenway, P.J. [12,524], Tanzania 30039.000
Polhill, R. [1685], Tanzania 3446.000
Brummitt, R.K. [11540A], Malawi 35099.000
Tweedie, M. [1161], Kenya 44384.000
Robson, N.K. [1448], Malawi 7049.000
Welwitsch [4170], Angola K000234375 Unknown type material
Welwitsch [4171], Angola K000234376 Unknown type material
Mechow [329], Angola K000234377 isotype
Baum [s.n.], Angola K000234374 Unknown type material
Harris, T. [377], Mozambique K000613813
Hepper, F.N. [2060], Cameroon K000028265
Ujor, E.U. [FHI 29974], Cameroon K000028266
s.coll. [Cat. no. 8254] Asclepias undulata K001125050
s.coll. [Cat. no. 8254] Asclepias undulata K001125049

First published in Hortus Kew. 2: 79 (1811)

Accepted by

  • Bruyns, P.V. (2014). The Apocynaceae of Namibia Strelitzia 34: 1-158. National Botanical Institute, Pretoria.
  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
  • Germishuizen, G. & Meyer, N.L. (eds.) (2003). Plants of Southern Africa: an annotated checklist. Strelitzia 14.: i-vi, 1-1231. National Botanical Institute, Pretoria.
  • Goyder, D.J., Gilbert, M.G. & Venter, H.J.T. (2020). Flora Zambesiaca 7(3): 1-375. Royal Botanic Gardens, Kew.
  • Goyder, S., Harris, T., Masinde, S., Meve, U. & Venter, J. (2012). Flora of Tropical East Africa, Apocynaceae(2): 1-530.
  • Hedberg, I., Edwards, S. & Nemomissa, S. (eds.) (2003). Flora of Ethiopia and Eritrea 4(1): 1-352. The National Herbarium, Addis Ababa University, Ethiopia & The Department of Systematic Botany, Upps.
  • Onana, J.M. (2011). The vascular plants of Cameroon a taxonomic checklist with IUCN assessments: 1-195. National herbarium of Cameroon, Yaoundé.

Literature

Kew Backbone Distributions

  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
  • Germishuizen, G. & Meyer, N.L. (eds.) (2003). Plants of Southern Africa: an annotated checklist. Strelitzia 14.: i-vi, 1-1231. National Botanical Institute, Pretoria.
  • Goyder, S., Harris, T., Masinde, S., Meve, U. & Venter, J. (2012). Flora of Tropical East Africa, Apocynaceae(2): 1-530.

Flora of Tropical East Africa

  • Cribb & Leedal, Mt Fl. S. Tanz.: 106, t. 24c (1982)
  • Fl. Eth. 4(1): 131, fig. 140.19 (2003).
  • Hort. Kew. ed. 2, 2: 79 (1811)
  • U.K.W.F. ed. 2: 176, pl. 67 (1994)

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0