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

[FTEA]

Acanthaceae (part 2), Kaj Vollesen. Flora of Tropical East Africa. 2008

Type
Type: Kenya, Northern Frontier District: Garissa–Liboi road, 24 km E of junction with Mado Gashi road, Bally & A. R. Smith 14979 (K!, holo.; BR!, C!, EA!, P!, WAG!, iso.)
Morphology General Habit
Shrubby herb to 30 cm tall with long arching or stoloniferous branches rooting at nodes; outer bark translucent, peeling in papery strips; stems up to 50 cm long, glabrous or stipule-sheats with a few broad glossy hairs
Morphology Leaves
Leaves fleshy, obovate or broadly so, largest 1.5–3.5 × 0.6–2.2 cm, apex truncate to retuse (rarely rounded), with a recurved triangular apical tooth, base attenuate, decurrent to base or with an indistinct petiole to 2 mm long, margin entire or crenate-dentate towards apex (rarely along whole margin), glabrous or immature (rarely also mature) stellate puberulous or with scattered long broad glossy hairs along midrib (rarely also along lateral veins), stipule-sheath 1.5–3 mm long
Morphology Reproductive morphology Flowers
Flowers in 1–3(–7)-flowered condensed axillary cymes with peduncle to 5 mm long; bracts to 1.2 cm long, obovate, glabrous; bracteoles similar or lanceolate, to 1(–1.5) cm long, glabrous or with scattered broad glossy hairs, sometimes finely ciliate
Morphology Reproductive morphology Flowers Calyx
Calyx 7–11(–13 in fruit) mm long, glabrous (rarely with a few broad glossy hairs), finely ciliate; tube 4–6 mm long; teeth narrowly triangular, acuminate, dorsal 3–5 mm long, ventral 2–3 mm long of which the free part 1–2 mm
Morphology Reproductive morphology Flowers Corolla
Corolla mauve to purple or deep blue with darker patches on lower lip (almost white in bud), tube yellowish-brown, 18–22(–31) mm long, finely puberulous; tube 12–14(–26) mm long of which the throat 4–5 mm; lips 5–8 mm long; lobes obovate, 3–6 mm wide, broadly rounded; palate indistinctly pleated, without long stiff hairs. Filaments included in throat, 3–5 mm long, pale mauve, with scattered hairs throughout; anthers 1.5–2 mm long, rounded, connective glabrous
Morphology Reproductive morphology Flowers Gynoecium Style
Style pale mauve; stigma lobes equal
Morphology Reproductive morphology Fruits
Capsule ± 8 mm long, obovoid
Morphology Reproductive morphology Seeds
Seed not seen.
Ecology
Open Acacia-Commiphora bushland on fawn sandy to fine clayey soils in areas liable to seasonal flooding, riverine forest on sandy alluvium; 200–350 m
Note
The presence of stellate hairs on the youngest leaves indicate that this species should – despite the almost complete lack of indumentum on mature parts – be classified with the species with stellate indumentum. It also differs from the other species in this group in its growth form, large purple corolla and very conspicuous stipule sheath. Mungai et al. 83/83 (Tana River District: Kampi ya Simba) has much larger flowers than the rest of the material (maximum dimensions in description) and is also slightly more hairy. But an even more hairy form occurs in S Somalia, and I have considered this to be an acceptable degree of variation in a rarely collected species.
Distribution
Range: Somalia Flora districts: K1 K4 K7

[FSOM]

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

Morphology Reproductive morphology Flowers Corolla
Corolla mauve to purple or deep blue with darker patches on lower lip, 18–22(–31) mm long; tube 12–14(–26) mm long
Morphology Reproductive morphology Fruits
Capsule c. 8 mm long, glabrous.
Distribution
S3 E Kenya
Ecology
Altitude range c. 100 m.
Morphology General Habit
Shrubby herb to 30 cm tall with branches rooting at nodes; stems glabrous or puberulous
Morphology Leaves
Leaf-blades entire to crenate-dentate, 15–35 x 6–22 mm, glabrous or sparsely pubescent with simple and/or stellate hairs when young, apex truncate to retuse, base attenuate; petiole up to 2 mm long
Morphology Reproductive morphology Inflorescences
Flowers in 1–3(–7)-flowered axillary cymes; bracts obovate, up to 12 mm long; bracteoles obovate or lanceolate, up to 10(–15) mm long
Morphology Reproductive morphology Flowers Calyx
Calyx glabrous or almost so, 7–11(–13) mm long; lobes narrowly triangular

Native to:

Kenya, Somalia

Duosperma stoloniferum Vollesen appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Apr 27, 2005 Bally [14979], Kenya K000394015 holotype

First published in Kew Bull. 61: 318 (2006)

Accepted by

  • Vollesen, K. (2008). Flora of Tropical East Africa, Acanthaceae(1): 1-285.

Literature

Flora of Somalia

  • Flora Somalia, Vol 1, (1993) Author: by M. Thulin [updated by M. Thulin 2008]

Flora of Tropical East Africa

  • K.B. 62: 318, fig. 9 (2006).

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
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