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This genus is accepted, and its native range is Tropical & Subtropical Old World.
Rhinacanthus polonnaruwensis

[FSOM]

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

Morphology General Habit
Herbs
Morphology Leaves
Leaves opposite, often with obscurely undulate-crenate margins
Morphology Reproductive morphology Inflorescences
Flowers in panicle-like inflorescences; bracts and bracteoles small, linear to lanceolate
Morphology Reproductive morphology Flowers Calyx
Calyx deeply 5-lobed; lobes linear-lanceolate
Morphology Reproductive morphology Flowers Corolla
Corolla 2-lipped; tube long, narrowly cylindric; upper lip entire or emarginate; lower lip 3-lobed
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2, shortly exserted; anthers 2-celled with one cell above the other
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 2-celled, with 2 ovules in each cell, hairy; style filiform, exserted; stigma shortly 2-lobed
Morphology Reproductive morphology Fruits
Capsule club-shaped, hairy
Morphology Reproductive morphology Seeds
Seeds tuberculate.
Distribution
Some 25 species in the Old World tropics.

[FZ]

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

Morphology General Habit
Perennial herbs or subshrubs; cystoliths numerous, ± conspicuous.
Morphology Stem
Stems 6-angular or terete, often with short pale retrorse and/or antrorse hairs.
Morphology Leaves
Leaves evergreen or rarely deciduous, opposite-decussate, petiolate, pairs equal to somewhat anisophyllous; blade margin entire or obscurely repand.
Morphology Reproductive morphology Inflorescences
Inflorescences axillary and/or terminal, fasciculate, spiciform or paniculate; bracts and bracteoles inconspicuous, then linear to lanceolate or the former leaf-like; flowers subsessile, in clusters or solitary.
Morphology Reproductive morphology Flowers Calyx
Calyx divided almost to base; lobes 5, subequal, linear-lanceolate.
Morphology Reproductive morphology Flowers Corolla
Corolla bilabiate, pubescent externally except towards base of tube where it is glabrous; tube narrowly long-cylindrical, usually longer than limb, roof with 2 lines of hairs within extending onto upper lip; upper lip ovate to lanceolate, apically notched or entire; lower lip divided in upper half or third into 3 subequal rounded to oblong lobes.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2; filaments attached near mouth of corolla tube, shortly exserted; anthers bithecous, thecae slightly to strongly offset, ± oblique, lower theca sometimes with a shor appendage (tail).
Morphology Reproductive morphology Flowers Disc
Disk shallowly cupular, with V-shaped slit.
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary bilocular, 2 ovules per locule; style filiform; stigma bifid, lobes unequal.
Morphology Reproductive morphology Fruits
Capsule clavate, long-stipitate, apex shortly beaked.
Morphology Reproductive morphology Seeds
Seeds held on retinacula, lenticular with a hilar excavation, brown to black, ± tuberculate.
Distribution
A genus of c. 25 species, confined to the Old World tropics and subtropics.

Native to:

Angola, Assam, Bangladesh, Benin, Botswana, Cambodia, Cameroon, Cape Provinces, Central African Repu, China South-Central, Comoros, Congo, East Himalaya, Ethiopia, Gabon, Ghana, Guinea, Guinea-Bissau, Gulf of Guinea Is., India, Ivory Coast, Kenya, KwaZulu-Natal, Laos, Liberia, Madagascar, Malawi, Malaya, Mozambique, Myanmar, Namibia, Nigeria, Northern Provinces, Philippines, Senegal, Sierra Leone, Socotra, Somalia, Sri Lanka, Tanzania, Thailand, Togo, Uganda, Vietnam, Zambia, Zaïre, Zimbabwe

Introduced into:

China Southeast, Hainan, Mauritius, Réunion

Rhinacanthus Nees appears in other Kew resources:

First published in N.Wallich, Pl. Asiat. Rar. 3: 76 (1832)

Accepted by

  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

Literature

Flora of West Tropical Africa

  • —F.T.A. 5: 224.

Flora Zambesiaca

  • in Wallich, Pl. Asiat. Rar. 3: 76 (1832).
  • —Darbyshire & Harris in Kew Bull. 61: 401–418 (2006).
  • —Nees in De Candolle, Prodr. 11: 442 (1847).

Flora of Somalia

  • 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