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This genus is accepted, and its native range is Tropical & Subtropical Old World.
Isoglossa variegata

[FZ]

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

Morphology General Habit
Annual or perennial herbs or shrubs, sometimes monocarpic and cyclically mass-flowering (plietesial); cystoliths present, linear, ± conspicuous.
Morphology Stem
Stems (sub-)4- or 6-angular, often grooved between angles when young, at least in a dry state.
Morphology Leaves
Leaves evergreen or deciduous, opposite-decussate, pairs equal to anisophyllous, blade margin entire, undulate or shallowly crenate, lower leaves petiolate or subsessile, uppermost leaves and those subtending inflorescences often sessile with rounded or cordate base.
Morphology Reproductive morphology Inflorescences
Inflorescence terminal and/or axillary in upper leaf axils, rarely on older leafless branches; spiciform or laxly paniculate thyrses, branching dichasial and/or monochasial, cymules 1 to several-flowered; bract pairs ± equal, free, shape and size variable, sometimes foliaceous, sometimes rapidly reducing in size along main inflorescence axis; bracteoles as bracts or much-reduced.
Morphology Reproductive morphology Flowers Calyx
Calyx usually divided almost to base into 5 subequal lobes, often lengthening in fruit.
Morphology Reproductive morphology Flowers Corolla
Corolla bilabiate; indumentum variable but always glabrous towards base of tube externally; tube cylindrical, campanulate or inflated; upper lip ± hooded, apex 2-lobed, lobes often reflexed; lower lip oblong, elliptic or obovate, apex 3-lobed, median lobe broader than lateral pair, palate and throat often raised upwards with a longitudinal central furrow and herring-bone-like transverse ridging.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2; filaments attached at various heights within corolla tube, exserted or held at mouth; anthers bithecous, thecae strongly offset or at subequal height, parallel to highly oblique, upper theca larger than lower or pair subequal in size, basally muticous; staminodes absent.
Morphology Reproductive morphology Flowers Disc
Disk shallowly cupular.
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary (oblong-)ovoid, largely glabrous, bilocular, 2 ovules per locule; style filiform; stigma shortly bilobed.
Morphology Reproductive morphology Fruits
Capsule stipitate, placental base inelastic.
Morphology Reproductive morphology Seeds
Seeds 4 per capsule or fewer by abortion, held on retinacula, lenticular, compressed-ellipsoid or subdiscoid, with a hilar excavation, variously tuberculate, rugose or smooth.
Distribution
Genus of 50–70 species with a palaeotropical and subtropical distribution, most diverse in East Africa.

[FSOM]

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

Morphology General Habit
Herbs or shrubs
Morphology Leaves
Leaves entire
Morphology Reproductive morphology Inflorescences
Flowers in terminal or axillary loose or contracted dichasial inflorescences
Morphology Reproductive morphology Flowers Corolla
Corolla 2-lipped with upper lip 2-lobed and lower lip 3-lobed
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2; anthers with 2 displaced cells, not tailed at the base
Morphology Reproductive morphology Fruits
Capsule 4-seeded in most species
Morphology Reproductive morphology Seeds
Seeds tuberculate.
Distribution
Genus of some 0 species in the Old World tropics.

Native to:

Angola, Assam, Burundi, Cambodia, Cameroon, Cape Provinces, China South-Central, China Southeast, Comoros, East Himalaya, Ethiopia, Free State, Guinea, Gulf of Guinea Is., Jawa, Kenya, KwaZulu-Natal, Lesotho, Lesser Sunda Is., Madagascar, Malawi, Malaya, Mozambique, New South Wales, Nigeria, Northern Provinces, Rwanda, Sierra Leone, Somalia, Sudan, Sulawesi, Swaziland, Tanzania, Thailand, Tibet, Uganda, Vietnam, Yemen, Zambia, Zaïre, Zimbabwe

Isoglossa Oerst. appears in other Kew resources:

First published in Vidensk. Meddel. Naturhist. Foren. Kjøbenhavn 1854: 155 (1855)

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: 227.

Flora Zambesiaca

  • in Vidensk. Meddel. Dansk Naturhist. Foren. Kjobenhavn: 155 (1854), conserved name.
  • —Brummitt in Kew Bull. 40: 785–791 (1985).
  • —Darbyshire in Kew Bull. 64: 401–427 (2009).
  • —Hansen in Nordic J. Bot. 5: 5 (1985).
  • —Kiel et al. in Taxon 55: 683–694 (2006).

Flora of Somalia

  • Flora Somalia, (2000) Author: by M. Hedrén [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