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

[FTEA]

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

Morphology Reproductive morphology Flowers Calyx
Calyx 6–11(–14 in fruit) mm long, glandular-puberulous or densely so, usually also with long pilose hairs; tube 5–6.5 mm long; teeth narrowly triangular to lanceolate, acute, dorsal 1–4.5 mm long, ventral 1.5–4 mm long with the free part 1–3 mm
Morphology Reproductive morphology Flowers Corolla
Corolla white to mauve or purple, with darker patches on lower lip and with orange-brown palate, 14–23 mm long, finely sericeous or sparsely so and with scattered capitate glands outside; tube 8–13 mm long of which the throat 2–4 mm; lips 5–10 mm long; lobes oblong-obovate, 1.5–3.5 mm wide, retuse to truncate; palate on lower lip with numerous long stiff hairs directed down into throat
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 2–5 mm long, sparsely puberulous at base and with scattered capitate glands towards apex; anthers 1.5–2 mm long, connective with usually dense captate glands
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma lobes subequal
Morphology Reproductive morphology Fruits
Capsule 7–10 mm long, obovoid, glabrous or with scattered glands near apex
Morphology Reproductive morphology Seeds
Seed 3–4 mm long
Figures
Fig 37, p243
Ecology
Grassland on grey to black alluvial clay, swamps, riverbanks, open Acacia bushland on white sandy-loamy hardpan, riverine woodland; often reported as being heavily grazed; (50–)200–1500 m
Type
Type: Mozambique, Rios de Sena, Peters s.n. (B†, holo.). Neotype: Mozambique, Gaza, Lago M’fucue, Barbosa & de Lemos 8585 (K!, neo, selected by Vollesen, l.c.; COI!, LISC!, PRE!, SRGH!, iso.)
Morphology General Habit
Erect (rarely decumbent) viscid glandular aromatic (when crushed) perennial or shrubby herb (often pyrophytic) from creeping rootstock and tuberous roots, or shrub; stems to 1(–1.5) m tall, usually much branched, quadrangular, when young sparsely to densely glandular-puberulous and with scattered longer glands (to 1 mm) intermixed, often also with long pilose non-glandular hairs up to 3 mm and with puberulous non-glandular hairs
Morphology Leaves
Leaves often immature at time of flowering, elliptic to slightly obovate, largest (mature) 3–15 × 1.3–5.5(–6.5) cm, apex subacute to rounded, base long-decurrent, without distinct petiole, margin subentire to dentate, glabrous or with scattered broad long glossy hairs on veins, more rarely uniformly puberulous
Morphology Reproductive morphology Flowers
Flowers solitary or in 3-flowered cymules, aggregated into racemiform cymes which are again aggregated into branched panicles, indumentum as young stems but with denser glands; bracts foliacaeous towards base, gradually smaller upwards; peduncles of cymules to 10(–30) mm long; pedicels 0–2 mm long; bracteoles elliptic to orbicular or obovate, 3–11 mm long, with recurved tip
Distribution
Range: Congo-Kinshasa, Angola, Zambia, Malawi, Mozambique, Zimbabwe, Botswana, Namibia. Flora districts: T5 T6 T7 T8

Native to:

Angola, Botswana, Caprivi Strip, Malawi, Mozambique, Tanzania, Zambia, Zaïre, Zimbabwe

Duosperma quadrangulare (Klotzsch) Brummitt appears in other Kew resources:

Date Reference Identified As Barcode Type Status
May 4, 2005 Johnston, H.H. [s.n.], Angola K000393952 lectotype
May 4, 2005 Johnston, H.H. [s.n.], Angola K000393953
May 4, 2005 Baum, H. [32], Angola K000393954 isotype
May 4, 2005 Whyte, A. [s.n.], Malawi K000393955 lectotype
May 4, 2005 Kirk [s.n.], Mozambique K000393956 syntype
May 4, 2005 Grandvaux Barbosa, L.A. [8585], Mozambique K000393957 neotype
Bidgood, S. [6282], Tanzania K000468143
Borges, E.A.J. [95], Angola K001009394
Pearson, H.H.W. [2555], Angola K001009393

First published in Kew Bull. 29: 412 (1974)

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.
  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
  • 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

  • K.B. 29: 412 (1974)
  • K.B. 62: 300, fig. 3 (2006).
  • Lebrun & Stork, Enum. Pl. Afr. Trop. 4: 479 (1997)
  • Mapura & Timberlake, Checklist Zimb. Vasc. Pl.: 13 (2004)
  • Opera Bot. 59: 80 (1980)
  • Phiri, Checklist Zamb. Vasc. Pl.: 18 (2005)
  • Ruffo, Cat. Lushoto Herb. Tanzania: 4 (1996)
  • Setshogo, Prelim. Checklist Botswana: 18 (2005)
  • Strelitzia 14: 98 (2003)
  • Syst. Geogr. Pl. 75: 56 (2005)

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