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

[FTEA]

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

Type
Type: Tanzania, Njombe District: eastern flank of Livingstone Mts, 5 km N of Mbwila village on Mlangali–Ludewa track, Gereau & Kayombo 4350 (K!, holo.; DSM!, EA!, MO!, NHT!, PRE!, iso.)
Morphology General Habit
Shrubby perennial herb with decumbent or ascending branched stems from woody rootstock; stems to 40 cm long, when young bifariously sericeouspuberulous with retrorse hairs, soon glabrescent, eventually with peeling bark
Morphology Leaves
Leaves elliptic to slightly obovate, largest 3.5–4.5 × 1.4–1.8 cm, more than twice as long as wide, apex subacute to rounded, base attenuate, decurrent to an ill-defined petiole to 3 mm long, glabrous apart from a few hairs on midrib and ciliate, petiole with scattered long hairs, margin crenate, tertiary veins not raised beneath; stipule sheath 1–1.5 mm long, finely sericeous and ciliate
Morphology Reproductive morphology Flowers
Flowers in 1–3-flowered axillary cymes; peduncles to 2 mm and pedicels ± 1 mm long; bracts and bracteoles leafy, obovate to 1.7 (bracts) or 1.2 (bracteoles) cm long, indumentum as leaves.
Morphology Reproductive morphology Flowers Calyx
Calyx 13–14 mm long, sparsely and finely puberulous or glabrous upwards, also with scattered broad glossy hairs on tube and basal part of teeth, apical part of teeth finely ciliate, tube 5–6 mm long; teeth narrowly triangular, acute, dorsal 7–8 mm long, ventral ± 6 mm long of which the free parts ± 3 mm
Morphology Reproductive morphology Flowers Corolla
Corolla white with mauve patches on lower lip, 21–24 mm long, minutely sericeous-puberulous; tube 10–13 mm long of which the throat 4–5 mm; lips 9–11 mm long; lobes obovate, 6–7 mm wide, broadly rounded to truncate; palate without long stiff hairs
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 6–8 mm long, with scattered hairs almost to apex; anthers ± 2.5 mm long, rounded, connective with dense glands and sparse hairs
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma lobes subequal
Morphology Reproductive morphology Fruits
Capsule and seed not seen
Ecology
Valley bottom Brachystegia woodland on sandy to loamy soil; ± 1525 m
Note
The relationships of this very distinct species are not at all clear but it is probably closest to D. tanzaniense and D. porotoense, from which it differs in the larger corolla and subglabrous leaves.
Distribution
Flora districts: T7 Range: Not known elsewhere

Native to:

Tanzania

Duosperma livingstoniense Vollesen appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Apr 27, 2005 Gereau, R.E. [4350], Tanzania K000393958 holotype

First published in Kew Bull. 61: 334 (2006)

Accepted by

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

Literature

Flora of Tropical East Africa

  • K.B. 62: 334, fig. 14 (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