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

[FTEA]

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

Type
Type: Tanzania, Mpwapwa, Greenway 2391 (K!, holo.; EA!, iso.)
Morphology General Habit
Erect shrubby herb to 1.3 m tall; young branches curly-puberulous or sparsely so, eventually pale yellow and with exfoliating bark
Morphology Leaves
Leaves ovate to elliptic, largest 3–8 × 1.4–3 cm, more than twice as long as wide or about the same, apex acute, base cuneate, decurrent into a distinct petiole to 8 mm long with long broad glossy hairs on edges, uniformly curly puberulous or sparsely so on both sides, margin dentate, venation beneath distinctly raised, reticulate; stipule sheath 1.5–3 mm long. Flowers in few- to many-flowered condensed widely separated axillary cymes; outer bracts foliaceous, to 2 cm long; inner bracts oblong, to 1 cm long, uniformly puberulous or sparsely so and with long broad glossy hairs along midrib and on margins; bracteoles similar, to 8 mm long, with scattered subsessile capitate glands
Morphology Reproductive morphology Flowers Calyx
Calyx 6–8(–10 in fruit) mm long, uniformly finely puberulous and with scattered to dense long broad glossy hairs along midrib and on lobes, with scattered short-stalked capitate glands, tube 4–6 mm long; teeth triangular, acute, dorsal 2–3 mm long, ventral 2–3 mm long of which the free part 1–2 mm
Morphology Reproductive morphology Flowers Corolla
Corolla white, 12–14 mm long, finely sericeous-puberulous; tube 7–8 mm long of which the throat ± 2 mm; lips 4–5 mm long; lobes oblong, ± 2 mm wide, emarginate; palate without long hairs
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 2–4 mm long, with a few hairs near base; anthers ± 1.5 mm long, rounded at both ends, connective with subsessile glands
Morphology Reproductive morphology Flowers Gynoecium Stigma
Dorsal stigma lobe about half the length of ventral
Morphology Reproductive morphology Fruits
Capsule and seed not seen
Ecology
Brachystegia-Combretum woodland on brown soil or on stony hillsides; 1200–1450 m
Note
Dayton (l.c.) possibly confuses D. trachyphyllum with D. crenatum when he writes that it is “reported to form impenetrable thickets on stony hill slopes in neighborhood (sic) of 4000 feet elevation in Dodoma Province, Tanganyika”. D. crenatum is (pers. obs.) a very common and often thicket forming species in the Mpwapwa–Dodoma area while D. trachypyllum (despite being described as “common” on the label of Greenway 2391) is known only from the two above mentioned collections. On the Iringa locality it was (pers. obs.) rare. Despite the presence of glandular hairs on bracts and calyx D. trachyphyllum is probably closer to the group of species around D. crenatum than to the species around D. quadrangulare. It differs from the species of the D. quadrangulare group in the widely separated condensed axillary cymes and the white corolla without stiff hairs on the palate.
Distribution
Range: Not known elsewhere Flora districts: T5 T7

Native to:

Tanzania

Duosperma trachyphyllum (Bullock) Dayton appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Apr 27, 2005 Greenway [2391], Tanzania K000393963 holotype
Bidgood, S. [5266], Tanzania K000190494

First published in Rhodora 47: 256 (1945)

Accepted by

  • Govaerts, R. (2000). World Checklist of Seed Plants Database in ACCESS D: 1-30141.
  • Vollesen, K. (2008). Flora of Tropical East Africa, Acanthaceae(1): 1-285.

Literature

Flora of Tropical East Africa

  • K.B. 29: 411 (1974)
  • K.B. 62: 331, fig. 12 K–M (2006).
  • Lebrun & Stork, Enum. Pl. Afr. Trop. 4: 479 (1997)
  • Rhodora 47: 236 (1945)

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