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This genus is accepted, and its native range is Tropical & S. Africa, Comoros, Madagascar, Arabian Peninsula.
A specimen from Kew's Herbarium

[FZ]

Flora Zambesiaca Acanthaceae (part 2) by Iain Darbyshire, Kaj Vollesen and Ensermu Kelbessa

Morphology General Habit
Shrubby herbs, shrubs or small trees; cystoliths conspicuous or not.
Morphology Leaves
Leaves opposite, equal, entire to crenate.
Morphology Reproductive morphology Inflorescences
Plants often flowering when leafless, flowers in dorsiventral racemoid cymes with strobilate bracts or in 1–12-flowered axillary dichasia or short cymes with minute bracts; bracts persistent, from large and showy to minute; bracteoles small.
Morphology Reproductive morphology Flowers Calyx
Calyx divided into 5 equal segments.
Morphology Reproductive morphology Flowers Corolla
Corolla glandular puberulous, sometimes also hairy (rarely glabrous) on the outside; basal part of tube short, cylindrical, widening slightly upwards; throat short, very indistinct; limb very distinctly 2-lipped with lips usually more than twice as long as tube and throat combined; upper lip hooded; lower lip usually pendent and coiled at anthesis, without rugula.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2, no staminodes, inserted at top of tube; anthers bithecous, thecae subequal, one a little below others, parallel, both mucronate or lower with minute appendage at base.
Morphology Reproductive morphology Flowers Gynoecium Style
Style filiform, glabrous or hairy; stigma minutely bifid with 2 ellipsoid lobes.
Morphology Reproductive morphology Fruits
Capsule 2–4-seeded, clavate with a solid basal stalk, placentae solid and not splitting from capsule wall or splitting from base or wall splitting longitudinally.
Morphology Reproductive morphology Seeds
Seeds spheroid to discoid, compressed or not, smooth to rugose or reticulate-tuberculate.
Distribution
A genus of 24 species in tropical Africa, Arabia and Madagascar. The centre of diversity is from S Ethiopia and S Somalia through E Kenya to Tanzania, and to a lesser degree onwards through Mozambique to E Zimbabwe and N South Africa.

[FSOM]

M. Thulin et al. Flora of Somalia Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Morphology General Habit
Shrubs or subshrubs
Morphology Leaves
Leaves entire or almost so
Morphology Reproductive morphology Flowers
Flowers in spikes, racemes or thyrses, with 2 bracteoles
Morphology Reproductive morphology Flowers Calyx
Calyx campanulate, 5-lobed
Morphology Reproductive morphology Flowers Corolla
Corolla 2-lipped; tube short; upper lip long and arching, entire or 2-fid at the tip; lower lip narrower than upper lip, 3-lobed
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2, long-exserted from tube but held under the upper lip of the corolla; anthers 2-celled with one cell a little above the other
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary with 2 ovules in each cell; style long-exserted from corolla-tube; stigma minutely 2-fid or entire
Morphology Reproductive morphology Fruits
Capsule obovoid, usually 4-seeded
Morphology Reproductive morphology Seeds
Seeds flattened.
Distribution
Some 29 species in tropical and southern Africa, Madagascar and tropical Arabia.

Native to:

Burundi, Cameroon, Central African Repu, Comoros, Congo, Ethiopia, Gabon, Guinea, Kenya, KwaZulu-Natal, Madagascar, Malawi, Mozambique, Nigeria, Northern Provinces, Saudi Arabia, Socotra, Somalia, Sudan, Swaziland, Tanzania, Uganda, Yemen, Zambia, Zaïre, Zimbabwe

Anisotes Nees appears in other Kew resources:

First published in A.P.de Candolle, Prodr. 11: 424 (1847)

Accepted by

  • Govaerts, R. (1995). World Checklist of Seed Plants 1(1, 2): 1-483, 529. MIM, Deurne.

Literature

Flora of West Tropical Africa

  • F.T.A. 5: 226.
  • in DC. Prod. 11: 424 (1847), nom. cons.

Flora Zambesiaca

  • in De Candolle, Prodr. 11: 424 (1847).
  • —Baden in Nordic J. Bot. 1: 623–664 (1981).

Flora of Somalia

  • Baden in Nord. J. Bot. 1: 623–664 (1981).
  • Flora Somalia, (2000) Author: by M. Thulin [updated by M. Thulin 2008]

Flora Zambesiaca
Flora Zambesiaca
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of Somalia
Flora of Somalia
http://creativecommons.org/licenses/by-nc-sa/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