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This genus is accepted, and its native range is NE. & E. Tropical Africa, Arabian Peninsula.
Echidnopsis cereiformis

[FTEA]

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

Morphology General Habit
Small, creeping stem-succulents, occasionally rhizomatous.
Morphology General Exudate
Latex clear or at most cloudy.
Morphology Stem
Stems cylindrical, roundly 5–20-angled, tubercles cushion-shaped, often papillose and/or rugose.
Morphology Leaves
Leaf rudiments sessile, withering soon, reflexed to ascending; stipules ovate or globoid, glandular
Morphology Reproductive morphology Inflorescences
Inflorescences usually appearing at upper regions of stems, 1–6-flowered, bostrychoid, sessile
Morphology Reproductive morphology Flowers Corolla
Corolla fleshy, rotatecampanulate, globose or tubular, fused to 4/5 of length, glabrous, papillose or with trichomes
Morphology Reproductive morphology Flowers Corona
Gynostegial corona in 2 series: “outer” corona of 5 staminal and 5 interstaminal parts fused almost completely to form a fleshy, rotate, cyathiform, urceolate or subglobose structure, occasionally with trichomes; interstaminal parts fused as described above, occasionally spur-shaped ( E dammanniana Spreng.) or saccate; “inner” staminal parts subulate, lingulate or triangular
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium sessile.
Morphology Reproductive morphology Flowers Pollinia
Pollinia minute, globoid or ovoid; caudicles trapezoidal
Morphology Reproductive morphology Fruits
Mericarps two.
Morphology Reproductive morphology Seeds
Seed winged
Note
Echidnopsis is well characterized by its small, creeping, tessellate stems. However, Rhytidocaulon not only shows many similarities with Echidnopsis, it also shares a clade with East African species in the molecular phylogeny of Thiv & Meve in Pl. Syst. Evol. 265: 71–86 (2007). Therefore, Echidnopsis is paraphyletic without Rhytidocaulon, and, possibly, both are to be taxonomically unified in future.

[FSOM]

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Morphology General Habit
Succulent herbs
Morphology Stem
Stems usually clustered, decumbent or ascending, producing underground stolons in some species, 5–20-angled, the angles with hexagonal or conical tubercles; latex clear
Morphology Leaves
Leaves scale-like, deciduous or persistent when dry, sometimes awl-shaped and persisting as stiff bristles
Morphology Reproductive morphology Inflorescences
Inflorescences from near tip of stems, usually 2–3-flowered, the flowers opening successively; pedicels mostly short
Morphology Reproductive morphology Flowers Corolla
Corolla shallowly cup-shaped to deeply urn-shaped; lobes variously shaped, glabrous to papillose or shortly hairy
Morphology Reproductive morphology Flowers Corona
Corona gynostegial, outer lobes joined in a cup or horn-like to linear; inner lobes incumbent on anthers and often connivent above gynostegium
Morphology Reproductive morphology Fruits
Follicles terete, slender, slightly diverging
Morphology Reproductive morphology Seeds
Seeds with a tuft of hairs at one end.
Distribution
Genus of over 30 species in eastern and north-eastern Africa, Arabian Peninsula and Socotra.

Native to:

Djibouti, Eritrea, Ethiopia, Kenya, Oman, Socotra, Somalia, Sudan, Tanzania, Yemen

Echidnopsis Hook.f. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Archer, P.G. [714], Kenya 48586.000
Archer, P.G. [669], Kenya 48587.000
Archer, P., Kenya 48591.000

First published in Bot. Mag. 97: t. 5930 (1871)

Accepted by

  • Govaerts, R. (2001). World Checklist of Seed Plants Database in ACCESS E-F: 1-50919.
  • Goyder, S., Harris, T., Masinde, S., Meve, U. & Venter, J. (2012). Flora of Tropical East Africa, Apocynaceae(2): 1-530.

Literature

Flora of Somalia

  • Bruyns in Bradleya 6: 1–48 (1988)
  • Flora Somalia, Vol 3, (2006) Author: by J. Lavranos [updated by M. Thulin 2008]
  • Plowes in Haseltonia 1: 65–85 (1993).

Flora of Tropical East Africa

  • Bot. Mag.: t. 5930 (1871)
  • Bradleya 6: 1–48 (1988)
  • Haseltonia 1: 65–85 (1993)
  • Pl. Syst. Evol. 265: 71–86 (2007)

Flora of Somalia
Flora of Somalia
http://creativecommons.org/licenses/by-nc-sa/3.0

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

Herbarium Catalogue Specimens

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