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

[FTEA]

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

Type
Type: Cameroon, Dusen 348A (B†, holo.; BM!, fragment and sketch of holotype)
Morphology General Habit
Shrubby herb or shrub to 1 m tall, basal part of stem sometimes creeping and rooting; stems fleshy, with 2 longitudinal bands of hairs when young, otherwise glabrous Perennial (rarely annual) or shrubby herbs or soft wooded shrubs with conspicuous cystoliths, usually drying blackish; stems quadrangular with conspicuously swollen nodes
Morphology Leaves
Leaves with petiole up to 2 cm long; lamina elliptic or narrowly so, longdecurrent on the petiole, largest 13–26 × 3.2–5.5 cm, apex acuminate, glabrous Leaves opposite, usually with two decurrent often toothed flanges on the petiole
Morphology Reproductive morphology Inflorescences
Spikes 5–17 cm long; peduncle 1–2 cm long, glabrous to puberulous; rachis puberulous, flattened; flowers opposite; bracts lanceolate to narrowly ovate, 5–8 mm long, glabrous, reflexed; bracteoles 8–12 mm long, elliptic, obtuse, finely puberulous along edges, 3–5veined
Morphology Reproductive morphology Flowers Calyx
Dorsal and ventral sepals 8–11 mm long, glabrous, with numerous strong veins, dorsal ovate, ventral broadly so or elliptic, lateral sepals linear, 6–8 mm long, 1-veined Calyx divided almost to the base into 5 sepals, these linear to ± spathulate, similar or dorsal larger
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers ± 3.5 mm long
Figures
Fig 24, p152
Ecology
Ground layer in evergreen lowland rainforest and swamp forest; 850–1200 m
Morphology Reproductive morphology Flowers
Flowers in large open or contracted panicles, rarely in racemoid cymes; bracts foliaceous; bracteoles absent
Morphology Reproductive morphology Flowers Corolla
Corolla distinctly 2-lipped, lips ± of equal length; tube short and broad, with a transverse fold just above insertion of stamens, slightly to distinctly constricted in upper part; upper lip 2-lobed, strongly hooded and laterally compressed; lower lip 3-lobed, ± flat or sides bent down, with a distinct “hinge” at base and with distinct “herring bone” pattern Corolla blue to purple or white, glandular hairy at base of lip and in a ventral band in upper half of tube; tube 8–11 mm long; limb 5–7 mm long, deflexed and curved backwards
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2 (dorsal), held in the upper lip, ventral reduced to 2 usually conspicuous staminodes; filaments long, inserted in tube and fused with it for some distance, broad and flattened, with a forwardly directed tooth; basal part hairy; anthers long, linear to narrowly oblong, 2-thecous, muticous, thecae parallel, at same height
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 2-locular, with numerous ovules; disk large, annular.
Morphology Reproductive morphology Flowers Gynoecium Style
Style linear, hairy, held under upper lip or exserted.
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma with linear ventral lobe usually wavy along the edge, dorsal lobe reduced to a small tooth
Morphology Reproductive morphology Fruits
Capsule linear, tetragonous with valves deeply grooved on the back; retinaculae indurated, curved Capsule 10–11 mm long, glabrous
Morphology Reproductive morphology Seeds
Seeds 6–15 per locule, discoid, ovoidcordiform, with dense hygroscopic hairs Seed 4–5 mm long, irregularly ellipsoid- circular, sparsely tuberculate
Distribution
Range: Nigeria, Cameroon, Gabon, Equatorial Guinea, Congo-Kinshasa Flora districts: U2 U4 T1 Range: 13 species in tropical Africa, mainly in the Guineo-Congolian forests, 2 species extending to Madagascar.

[FWTA]

Acanthaceae, H. Heine. Flora of West Tropical Africa 2. 1963

Morphology General Habit
An erect undershrub
Morphology Leaves
Rather long thin pale green leaves
Morphology Reproductive morphology Flowers
Bracteate flowers nearly 1/2 in. long in a terminal spike.

Native to:

Cameroon, Congo, Equatorial Guinea, Gabon, Gulf of Guinea Is., Nigeria, Tanzania, Uganda, Zaïre

Crossandrella dusenii (Lindau) S.Moore appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Oct 1, 2013 Fenton, E. [230], Cameroon K000745954
Jul 1, 2008 Schoenenberger, J. [292], Cameroon K000518913
Jul 1, 2008 Cable, S. [2346], Cameroon K000518922
Jan 1, 1994 Ndam, N. [795], Cameroon K000339302
Jan 1, 1994 Tchouto (Mbatchou), P. [625], Cameroon K000339353
Jan 1, 1994 Akogo, M. [98], Cameroon K000011286
Jan 1, 1994 Williams, S. [78], Cameroon K000436009
Jan 1, 1994 Tchouto (Mbatchou), P. [766], Cameroon K000339301
Jan 1, 1989 Thomas, D.W. [7874], Cameroon K000029255
Troupin, G. [3844], Congo, DRC 2806.000
Ujor, E. [29276], Cameroon 4220.000
Brown, E. [210], Uganda K000394403 holotype
Olorunfemi, J. [FHI 30643], Cameroon K000109576
Ujor, E.U. [FHI 29276], Cameroon K000109575

First published in A.B.Rendle & al., Cat. Pl. Oban: 74 (1913)

Accepted by

  • Exell, A.W. (1973). Angiosperms of the islands of the gulf of Guinea (Fernando Po, Príncipe, S.Tomé, and Annobon) Bulletin of the British Museum (Natural History). Botany 4: 325-411.
  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne.
  • Lejoy, J., Ndjele, M.-B. & Geerinck, D. (2010). Catalogue-flore des plantes vasculaires des districts de Kisangani et de la Tshopo (RD Congo) Taxonomania 30: 1-307.
  • Sita, P. & Moutsambote, J.-M. (2005). Catalogue des plantes vasculaires du Congo, ed. sept. 2005: 1-158. ORSTOM, Centre de Brazzaville.
  • Vollesen, K. (2008). Flora of Tropical East Africa, Acanthaceae(1): 1-285.

Literature

Flora of West Tropical Africa

  • in Cat. Talb. 74 (1913).

Kew Backbone Distributions

  • Exell, A.W. (1973). Angiosperms of the islands of the gulf of Guinea (Fernando Po, Príncipe, S.Tomé, and Annobon) Bulletin of the British Museum (Natural History). Botany 4: 325-411.
  • Sita, P. & Moutsambote, J.-M. (2005). Catalogue des plantes vasculaires du Congo, ed. sept. 2005: 1-158. ORSTOM, Centre de Brazzaville.

Flora of Tropical East Africa

  • Adansonia, Ser. 2, 11: 647 (1971)
  • Bull. Nat. Hist. Mus. London 28: 67 (1998)
  • Cat. Pl. Nig. Talbot: 74 (1913)
  • F.T.A. 5: 37 (1899)
  • F.W.T.A. (ed. 2) 2: 412 (1963)
  • Fl. Gabon 13: 110 & pl. 22, fig. 11–20 (1966)
  • K.B. 46: 335 (1991)
  • Lebrun & Stork, Enum. Pl. Afr. Trop. 4: 476 (1997).
  • T.T.C.L.: 6 (1949)

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of West Tropical Africa
Flora of West Tropical 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