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This genus is accepted, and its native range is Somalia, Arabian Peninsula.
A specimen from Kew's Herbarium

[LKGF]

Harley, R.M. et al. (2004). Labiatae, in The Families and Genera of Vascular Plants (K. Kubitzki, ed. in chief) VI: 167-275. Springer-Verlag, Berlin, Heidelberg, New York.

Morphology General Habit
Subshrub, densely whitish pubescent with branched hairs
Morphology Leaves
Leaves petiolate, blade suborbicular
Morphology Reproductive morphology Inflorescences
Inflorescence racemoid
Morphology Reproductive morphology Inflorescences Bracteoles
Bracteoles minute, at base of pedicel
Morphology Reproductive morphology Flowers Calyx
Calyx 2-lipped, obconical, 5-lobed (3/2), lobes triangular, subacute, anterior much smaller than posterior, tube densely annulate with simple hairs
Morphology Reproductive morphology Flowers Corolla
Corolla strongly 2-lipped, 4-lobed (1/3), white, posterior lip long, hooded, bearded with simple hairs and densely pubescent outside
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens not or only shortly exserted from corolla, thecae weakly distinct
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma-lobes slightly unequal
Morphology Reproductive morphology Fruits
Nutlets rounded and with sessile glands at apex.
Note
One species, I. arabica O. Schwartz
Ecology
In semi-desert
Distribution
Southeastern Yemen.

Native to:

Somalia, Yemen

Isoleucas O.Schwartz appears in other Kew resources:

First published in Mitt. Inst. Allg. Bot. Hamburg 10: 223 (1939)

Accepted by

  • Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew.

Literature

Lamiaceae Key Genus Fact Sheets

  • Harley RM, Atkins S, Budantsev AL, Cantino PD, Conn BJ, Grayer R, Harley MM, de Kok RPJ, Krestovskaja T, Morales R, Paton AJ, Ryding O, and Upson T. 2004. Labiatae, in The Families and Genera of Vascular Plants (K. Kubitzki, ed. in chief) VI: 167-275. Sp
  • Isoleucas O. Schwartz, Mitt. Inst. Allg. Bot. Hamburg 10: 223 (1939).

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

Lamiaceae Key Genus Fact Sheets
Nina Davies, Gemma Bramley and Don Kirkup, Royal Botanic Gardens, Kew
http://creativecommons.org/licenses/by/3.0