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This species is accepted, and its native range is Ethiopia to S. Africa.
Duosperma crenatum (Lindau) P.G. Meyer

[FTEA]

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

Type
Type: Tanzania, Mpwapwa, Stuhlmann 287 (B†, holo.; K!, iso.)
Morphology General Habit
Erect to decumbent or scrambling aromatic (when crushed) shrubby herb or shrub, to 2(?–3) m tall; bark peeling in papery strips; young stems glabrous to strigose-pubescent or sericeous-puberulous to -pubescent with broad shiny sometimes curly hairs
Morphology Leaves
Leaves ovate to elliptic or slightly obovate, largest (2.5–)4–10.5 × 1.5–5.5 cm, normally over twice as long as wide, apex drawn out into an acute to acuminate tip or acute to acuminate (rarely rounded), base attenuate to cuneate with a more or less distinct petiole to 1(–2) cm long, subglabrous to sparsely sericeous-puberulous or -pubescent (below densest along veins, above uniformly) with broad shiny hairs, margin crenate to dentate (rarely subentire); petiole sheath to 1(–2) mm long
Morphology Reproductive morphology Flowers
Flowers in few- to many-flowered condensed axillary cymes, upwards gradually with fewer flowers and near apex often with some solitary flowers; outer bracts leafy, to 2.5 cm long; inner bracts to 1.5 cm long, constricted above a hyaline base and with widened apical part or lanceolate to narrowly ovate, glabrous or with scattered to dense broad shiny hairs along midrib and glabrous to sericeous or puberulous lamina, ciliate; bracteoles lanceolate to narrowly ovate or oblanceolate, to 1 cm long, acute to acuminate
Morphology Reproductive morphology Flowers Calyx
Calyx 4–8(–11 in fruit) mm long, indumentum as bracts and bracteoles; tube 2.5–6 mm long; teeth narrowly triangular, acute to acuminate, dorsal 1–3 mm long, ventral 1–3 mm long of which the free part 0.5–1 mm long
Morphology Reproductive morphology Flowers Corolla
Corolla white or creamy white with two red to purple patches on lower lip, 7–11 mm long, minutely sericeous-puberulous; tube 4–6 mm long of which the throat 1–2 mm; lips 2–5 mm long; lobes oblong, 1–1.5 mm wide, truncate to retuse; palate indistinctly pleated, without long stiff hairs
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 2–4 mm long, with a few hairs near base; anthers 1–1.5 mm long, rounded, connective glabrous or with scattered glands. Dorsal stigma lobe about half as long as ventral
Morphology Reproductive morphology Fruits
Capsule 6–8 mm long, obovoid. Seed ± 4 mm long
Figures
Fig 38: 1-11, p250
Ecology
Acacia and Acacia-Commiphora woodland, bushland and thicket on clayey or sandy to gravelly or stony soils, Acacia-Euphorbia thickets on rocky slopes, Terminalia bushland on alkaline alluvium, grassland; 600–1450(–1700) m
Note
In the dry central parts of Tanzania this is often a common thicket-forming species in Acacia-Commiphora bushland. It seems hardly ever to be eaten by cattle, and is therefore favoured by slight to moderate overgrazing.
Distribution
Range: Ethiopia, Zambia, Malawi, Mozambique, Zimbabwe, Botswana, Namibia, South Africa Flora districts: K4 K6 K7 T1 T2 T3 T5 T6 T7

Native to:

Botswana, Caprivi Strip, Ethiopia, Kenya, Malawi, Mozambique, Namibia, Northern Provinces, Tanzania, Zambia, Zimbabwe

Duosperma crenatum (Lindau) P.G.Mey. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Sep 1, 2005 Hochobes, M.M. [MH1136], Namibia K000449626
May 4, 2005 Buchanan, J. [556], Malawi K000393944 isotype
Apr 26, 2005 Stuhlmann [287], Tanzania K000393894 isotype
Bidgood, S. [6329], Tanzania K000468096
Hornby, R.M. [2a], Tanzania Disperma crenatum 16930.000

First published in Mitt. Bot. Staatssamml. München 3: 602 (1960)

Accepted by

  • Baksh-Comeau, Y., Maharaj, S.S., Adams, C.D., Harris, S.A., Filer, D.L. & Hawthorne, W.D. (2016). An annotated checklist of the vascular plants of Trinidad and Tobago with analysis of vegetation types and botanical 'hotspots' Phytotaxa 250: 1-431.
  • 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

Kew Backbone Distributions

  • Baksh-Comeau, Y., Maharaj, S.S., Adams, C.D., Harris, S.A., Filer, D.L. & Hawthorne, W.D. (2016). An annotated checklist of the vascular plants of Trinidad and Tobago with analysis of vegetation types and botanical 'hotspots' Phytotaxa 250: 1-431.

Flora of Tropical East Africa

  • Grignon & Johnsen, Checklist Vasc. Pl. Botswana: 4 (1986)
  • K.B. 29: 411 & 414 (1974)
  • K.B. 62: 326, fig. 11 A–L (2006).
  • Lebrun & Stork, Enum. Pl. Afr. Trop. 4: 479 (1997)
  • Mapura & Timberlake, Checklist Zimb. Vasc. Pl.: 13 (2004)
  • Mitt. Bot. Staatssaml. München 3: 602 (1960)
  • Phiri, Checklist Zamb. Vasc. Pl.: 18 (2005)
  • Prodr. Fl. SW. Afr. 130. Acanthaceae: 28 (1968)
  • Serengeti Res. Inst. Publ. 215: 25 (1976)
  • U.K.W.F., ed. 2: 270 (1994)

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

Plants and People Africa
Common Names from Plants and People Africa http://www.plantsandpeopleafrica.com/
© Plants and People Africa http://www.plantsandpeopleafrica.com http://creativecommons.org/licenses/by/3.0/