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This genus is accepted, and its native range is China to Temp. E. Asia.
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
Perennial herbs, often with slender rhizomes, pubescent with simple hairs
Morphology Leaves
Leaves ovate-acuminate, toothed, long-petiolate
Morphology Reproductive morphology Inflorescences
Inflorescence thyrsoid, with cymes up to 3-flowered, or racemoid
Morphology Reproductive morphology Flowers Calyx
Calyx 2-lipped, 5-lobed (3/2), lobes spiny, unequal, anterior lip longer
Morphology Reproductive morphology Flowers Corolla
Corolla strongly 2-lipped, 4-lobed (1/3), pink to dark purple, posterior lip long, hooded
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens not exserted from corolla, thecae weakly distinct
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma-lobes subequal
Morphology Reproductive morphology Fruits
Nutlets truncate to rounded, eglandular hairy or glabrous.
Note
About three species.
Ecology
Forest and stream sides
Distribution
China and Japan.  The only Japanese species L. ambiguus (Makino) Makino, is often placed in Lamium.

Native to:

China North-Central, China South-Central, China Southeast, Japan

Loxocalyx Hemsl. appears in other Kew resources:

First published in J. Linn. Soc., Bot. 26: 308 (1890)

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
  • Loxocalyx Hemsl., J. Linn. Soc. Bot. 26: 308 (1890).

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