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

[FTEA]

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

Type
Type: Tanzania, Mbeya District: Poroto Mts, Chimala, Bidgood, Congdon & Vollesen 2105 (K!, holo.; BR!, C!, CAS!, DSM!, K!, NHT!, UPS!, iso.)
Morphology General Habit
Perennial or shrubby herb with erect (rarely decumbent) branched stems from woody rootstock; stems to 1(–1.5) m tall, glabrous to bifariously sericeous (hairs retrorse) or puberulous and with (rarely without) sparse to dense broad glossy hairs to 1.5 mm long; bark eventually peeling in large papery strips
Morphology Leaves
Leaves ovate to elliptic, largest 4.5–11 × 2–4.5 cm, more than twice as long as wide, apex subacute to acuminate (rarely rounded), base attenuate to truncate, decurrent to a distinct petiole to 1(–2) cm long, with sparse long broad hairs, below densest (or only) along veins, above uniformly dispersed, rarely sericeous-pubescent or subglabrous, petiole distinctly ciliate with broad glossy hairs, margin crenate to dentate, tertiary veins distinctly raised beneath; stipule sheath to 1 mm long, ciliate and usually hairy
Morphology Reproductive morphology Flowers
Flowers subsessile, in many-flowered well separated condensed axillary cymes (rarely 1- or few-flowered); peduncles 1–3(–4) mm long, glabrous to puberulous or sericeous; outer bracts foliaceous, to 2.2 cm long; inner bracts and bracteoles lanceolate to ovate, to 1.5 cm long, acuminate to cuspidate, subglabrous to puberulent, without or with sparse to dense long broad glossy hairs, ciliate
Morphology Reproductive morphology Flowers Calyx
Calyx 8–15(–18 in fruit) mm long, glabrous (rarely puberulous or sparsely so), tube and basal part of teeth also with (rarely without) sparse to dense long (to 1.5 mm) broad glossy hairs, apical part of teeth with shorter hairs, sometimes with a few stalked capitate glands near base of tube, tube 4–7 mm long; teeth lanceolate to narrowly triangular, acuminate to cuspidate, dorsal 5–8 mm long (same length or longer than tube), ventral 4–7 mm long of which the free part 2–5 mm long
Morphology Reproductive morphology Flowers Corolla
Corolla white with red to purple lines or patches on lower lip, 12–17(–20) mm long, finely sericeous-puberulous or sparsely so; tube 8–10(–12) mm long of which the throat 2–4(–5) mm long; lips 4–9 mm long; lobes oblong to obovate, 1.5–4(–6) mm wide, truncate to retuse; palate with or without scattered to dense stiff hairs. Filaments 2–5 mm long, with scattered hairs near base; anthers 1–2 mm long, thecae rounded or finely apiculate at base, connective with scattered to dense glands. Stigma lobes subequal or dorsal distinctly shorter
Morphology Reproductive morphology Fruits
Immature capsule 7–8 mm long, obovoid
Morphology Reproductive morphology Seeds
Seed not seen
Ecology
Brachystegia woodland on brown to red gritty to stony soil on rocky slopes, Combretum bushland on limestone slope, Acacia woodland, grassland on old cultivations; (800–)1000–1650(–1800) m
Distribution
Range: Not known elsewhere Flora districts: T4 T5 T7 T8

Native to:

Tanzania

Duosperma tanzaniense Vollesen appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Apr 27, 2005 Bidgood, S. [2105], Tanzania K000393961 isotype
Apr 27, 2005 Bidgood, S. [2105], Tanzania K000393962 holotype
Bidgood, S. [5432], Tanzania K000190662
Bidgood, S. [5342], Tanzania K000190572

First published in Kew Bull. 61: 333 (2006)

Accepted by

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

Literature

Flora of Tropical East Africa

  • K.B. 62: 333, fig. A–K (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