Inflorescence axillary, dichasial cymes; bracts ± as long as calyx; bracteoles similar
Calyx regular, glandular, hairy; lobes 5, ovate, with posticous ones larger than others; tube shorter than lobes
Corolla ± 2-lipped; upper lip 3-lobed, transversely ribbed on palate and with stiff, reflexed hairs, rugula indistinct; lower lip 2-lobed; all lobes retuse; aestivation contorted; tube cylindric below, narrowly campanulate above, longer than lobes
Androecium: fertile stamens 4, didynamous; filaments arising in pairs in throat of corolla, slightly exserted, linear; anthers 2-thecous; thecae parallel, muticous; staminodes 0
Pollen prolate, 3-porate, with pseudocolpi; pore lipped; surface reticulate
Disc annular
Gynoecium: ovary with 1 or 2 ovules in each locule; style subterete, exserted, sparsely hairy; style branches 1 or 2; ventral lobe more developed, cylindriform
Capsule 2-seeded, obovoid-ellipsoid, much flattened, woody, shiny brown, estipitate, with inelastic placental bases
Seeds discoid, with hygroscopic hairs over whole surface
Nomenclature:
Duosperma Dayton
Dayton: 262 (1945)
Meyer: 28 (1968)
Disperma C.B.Clarke
Clarke: 79 (1899) not of J.F.Gmel
Distribution & Notes:
Global: Species 12, Africa
Southern Africa: Species 2, Namibia, Botswana and Mpumalanga
References:
BURKILL, I.H. & CLARKE, C.B. 1899. Acanthaceae. Flora of tropical Africa 5
CLARKE, C.B. 1899. see BURKILL & CLARKE. 1899
DAYTON, W.A. 1945. Duosperma. Rhodora 47
MEYER, P.G. 1968. Acanthaceae. Prodromus einer Flora von Südwestafrika 130
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Welcome to Biodiversity Advisor 2.0!
Biodiversity Advisor, developed by the South African National Biodiversity Institute (SANBI) and its Data Partners, is a system that will provide integrated biodiversity information to a wide range of users who will have access to geospatial data, plant and animal species distribution data, ecosystem-level data, literature, images and metadata.
The integrated information comes from our much-loved Botanical Database of Southern Africa (BODATSA) also known as Plants of Southern Africa (POSA), Zoological Database of Southern Africa (ZODATSA), Biodiversity Geographic Information System (BGIS), SANBI's institutional repository (Opus) and others.
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