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

[FTEA]

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

Type
Type: Kenya, Meru District: Tana-Rojeweru confluence, Gillett 18899 (K!, holo.; B!, BR!, EA!, M!, NHT!, P!, WAG!, iso.)
Morphology General Habit
Much branched erect (rarely scrambling or decumbent) shrubby herb or shrub to 2 m tall; outer bark papery and flaky; young branches subglabrous to puberulous with stellate and simple hairs
Morphology Leaves
Leaves rough, ovate to elliptic or broadly so, largest 1.7–6.5 × 1.2–3.2 cm, apex acute to truncate, with a triangular central tooth, base attenuate to cuneate (rarely rounded), decurrent to a distinct petiole to 5(–8) mm long, margin crenate to dentate; stellate puberulous or sparsely so (rarely subglabrous), below also with long broad glossy hairs (middle hair in each cluster much elongated), stellate hairs sometimes only present on young leaves (rarely not at all), stipule-sheath 1–2.5 mm long
Morphology Reproductive morphology Flowers
Flowers in 1–3(–7)-flowered axillary cymes with peduncle to 4(–6) mm long; bracts and bracteoles obovate-spathulate, to 2.5(–3) cm long, indumentum as leaves
Morphology Reproductive morphology Flowers Calyx
Calyx 10–19 mm long, sparsely puberulent to puberulous with simple and sometimes also stellate hairs (rarely with scattered capitate glands), sometimes also with long hairs along veins or glabrous with long hairs along veins; tube 6–8 mm long; teeth lanceolate to narrowly triangular, dorsal 3–6 mm long, ventral 4–6 mm long of which the free part 1–4 mm
Morphology Reproductive morphology Flowers Corolla
Corolla white to mauve, with or without purple patches on lower lip, 30–40(–50) mm long, puberulous or sparsely so with stalked capitate glands only or with intermixed non-glandular hairs; tube 13–25 mm long of which the throat 3–8(–12) mm; lips 12–25 mm long, usually deeply split between upper and lower; lobes obovate, 5–12 mm wide, broadly rounded; palate indistinctly pleated, without long stiff hairs
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 7–10 and 15–18 mm long (longer pair 8–10 mm longer than shorter pair), with a few scattered hairs near base; anthers 1.5–2.5 mm long, finely apiculate, connective glabrous
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma lobes subequal.
Morphology Reproductive morphology Fruits
Capsule 7–11 mm long, ellipsoid
Morphology Reproductive morphology Seeds
Seed ± 4 mm long
Ecology
Acacia-Commiphora bushland, Acacia and Combretum woodland and wooded grassland, on red sandy or stony granitic soils or on rocky slopes; 300–1200(–1400) m
Note
It is surprising that this relatively common species, which has by far the largest flowers of any species of Duosperma, has until recently been without a name. Apart from the corolla size it differs from the other species with stellate indumentum in having a corolla indumentum consisting mostly of stalked capitate glands.
Distribution
Flora districts: K1 K4 K7 Range: Not known elsewhere

Native to:

Kenya

Duosperma grandiflorum Vollesen appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Apr 27, 2005 Gillett, J.B. [18899], Kenya K000394014 holotype

First published in Kew Bull. 61: 320 (2006)

Accepted by

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

Literature

Flora of Tropical East Africa

  • K.B. 62: 320, fig. 10 (2006).

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