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

[FTEA]

Acanthaceae (part 1), Kaj Vollesen, Flora of Tropical East Africa, 2008

Morphology General Habit
Erect shrub to 1 m tall, often single-stemmed and unbranched; young branches yellowish hirsute to villose.
Morphology Leaves
Leaves sometimes clustered towards end of branches; petiole villose, up to 2.5 cm long; lamina elliptic to obovate, largest 14–25 × 5–10 cm, apex rounded or drawn out into a short acute tip, base attenuate to truncate, pilose or sparsely so on both sides, densely so along midrib and larger veins.
Morphology Reproductive morphology Inflorescences
Cyme solitary, 4–11 cm long, sessile; rachis pilose; bracts yellowish green or slightly purplish tinged, ovate-elliptic or broadly so, 18–25 × 8–17 mm, subacute to obtuse and apiculate, uniformly puberulous, margin entire (rarely dentate); bracteoles thickened at base, narrowly ovate, 12–19 mm long, cuspidate, puberulent on back, puberulous-ciliate and sometimes with puberulous midrib.
Morphology Reproductive morphology Flowers Calyx
Sepals thickened at base, narrowly ovate (dorsal slightly wider), 16–20 mm long, cuspidate, puberulent towards tip and finely ciliate.
Morphology Reproductive morphology Flowers Corolla
Corolla-limb pale lilac to purple; tube white, cylindric, basal part ± 5 mm long, twisted part ± 6 mm long, upper part ± 5 mm long; limb 5–7 mm long, slightly hooded.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments ± 1.5 mm long; anthers ± 3 mm long.
Morphology Reproductive morphology Flowers Gynoecium Style
Style 12–14 mm long.
Morphology Reproductive morphology Fruits
Capsule 18–22 mm long.
Morphology Reproductive morphology Seeds
Seed (immature) ± 5 × 4 mm.
Figures
Fig. 20.
Distribution
Range: Tanzania. Flora districts: T8 Range: Not known elsewhere Range: Not known elsewhere
Ecology
Semi-deciduous lowland forest; 200–700 m
Note
The absence of cystoliths, sepals which are thickened and horny at base and the 1-lipped corolla leaves no doubt as to the correctness of placing Streptosiphon in Acanthoideae. But the 5 subequal 1-toothed sepals point more towards Stenandrium which, however, has a subactinomorphic 5-lobed corolla. Within Acanthoideae it must be considered closest to the other genera with included stamens: Crossandra, Crossandrella and Stenandrium. Streptosiphon is probably closest to Crossandra with which it shares the 1-lipped corolla and seeds with large pectinate scales. It differs from all other genera here in its peculiar corolla. Streptosiphon differs from all three genera in having the stamens inserted on a thickened flange, a character which point at a relation with the genera with exserted stamens: Acanthus, Blepharis and Sclerochiton. A tendency for the corolla limb to be only obscurely lobed is seen in Crossandrella, but this genus has a quite different calyx.

Native to:

Tanzania

Streptosiphon hirsutus Mildbr. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Schlieben [6098], Tanzania K000394413 isotype

First published in Notizbl. Bot. Gart. Berlin-Dahlem 12: 719 (1935)

Accepted by

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

Literature

Kew Backbone Distributions

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

Flora of Tropical East Africa

  • K.B. 49: 405 (1994)
  • Lebrun & Stork, Enum. Pl. Afr. Trop. 4: 504 (1997).
  • N.B.G.B. 12: 719 (1935)
  • T.T.C.L.: 16 (1949)

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