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This species is accepted, and its native range is N. Thailand (Doi Chiang Dao).

[KBu]

Suddee, S., A. J. Paton, & Parnell, J. (2004). A Taxonomic Revision of Tribe Ocimeae Dumort. (Lamiaceae) in Continental South East Asia II. Plectranthinae. Kew Bulletin, 59(3), 379-414. doi:10.2307/4110950

Conservation
The single locality is a protected area, but possibly prone to habitat degradation by tourism, and in particular undisciplined trekkers (Santisuk 1998). CR B1+2 ab(i,ii,iii).
Distribution
Endemic to higher elevation of Doi Chiang Dao, a limestone massif in Northern Thailand.
Ecology
Rocky areas in open limestone mountain; 1300 - 2100 m.
Morphology General Habit
Erect perennial herbs up to 50 cm tall
Morphology Leaves
Leaves subpapery when dry, ovate-oblong, 30 - 80 x 15 - 30 mm, apex acute or acuminate, base cuneate, margin crenate, puberulous and densely dotted with minute glands on both sides, veins conspicuous beneath; petioles 5 - 15 mm long, puberulous, deciduous, leaving a large prominent scar
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens shortly but clearly united at base, included in anterior corolla lip
Morphology Reproductive morphology Flowers Calyx
Calyx tubular-campanulate, 2 mm long at anthesis, 5 - 7 mm long in fruit; posterior lip ovate, acute at apex, constricted at base, margin entire, glabrous with prominent veins inside, pubescent with gland-tipped hairs and sessile glands outside; anterior lip with teeth equal in length, slightly shorter than posterior lip, median teeth lanceolate, lateral teeth ovate with upper margin greatly extended towards posterior lip; tube 10-nerved, densely pubescent with gland-tipped hairs and with sessile glands, with short obtuse spur at anterior base
Morphology Reproductive morphology Flowers Corolla
Corolla yellowish-white, 7 - 10 mm long; posterior lip subequal, lobes minute, rounded at apex, slightly pubescent on back; anterior lip ovate-oblong, 3 - 5 mm long, concave, shortly pubescent inside, densely pubescent with gland-tipped hairs and sessile glands outside; tube 3 - 5 mm long, sigmoid below the middle, slightly dilated at base, widely expanded at throat, pubescent with gland- tipped hairs and sessile glands outside
Morphology Reproductive morphology Flowers Disc
Disc with anterior side thick, obtuse at apex, exceeding ovary
Morphology Reproductive morphology Flowers Gynoecium Style
Style bifid with equal branches, subequal to anterior stamens or slightly shorter
Morphology Reproductive morphology Fruits
Nutlets brown, ovoid, 1.5 mm long, slightly rugose at apex, not producing mucilage when wet.
Morphology Reproductive morphology Inflorescences
Inflorescence terminal, up to 20 cm long, much branched; axis pubescent with short dark brown simple and gland- tipped patent hairs, with sessile glands; verticils 3 - 8 mm apart, clearly interrupted; cymes 1-flowered; bracts sessile, early-caducous, ovate, 2 - 3 mm long, acute, ciliate, pubescent; pedicels 1 mm long at anthesis, 1.5 - 2 mm long in fruit, pubescent with gland-tipped patent hairs
Morphology Stem
Stems stout and woody at base, branched, internodes short, quadrangular, glabrous below, glabrescent above
Note
On transfer to Plectranthus, a new name is needed because the epithet 'calcicola' exists in Plectranthus (P. calcicola Hand. Mazz. (1936)) [= Isodon calcicolus (Hand.-Mazz.) H. Hara]. The single-flowered cymes, the stout stem base with large leaf scars and the very large lateral calyx teeth easily distinguish this species from other species of Plectranthus.
Phenology
Flowering & fruiting September - November.
Type
Thailand, Chiang Mai, Doi Chiang Dao, 1500 m, 15 Sept. 1967, Shimizu & Hutoh T-10153 (holotype KYO!; isotypes BKF!, KYO!, TI!).
Vernacular
Thai: Ta Pao Hin (ex Put).

Native to:

Thailand

Coleus calcicola Murata appears in other Kew resources:

First published in Acta Phytotax. Geobot. 24: 105 (1970)

Accepted by

  • Paton, A.J., Mwanyambo, M. Govaerts, R.H.A., Smitha, K., Suddee, S., Phillipson, P.B., Wilson, T.C., Forster, P.I. & Culham, A. (2019). Nomenclatural changes in Coleus and Plectranthus (Lamiaceae): A tale of more than two genera PhytoKeys 129: 1-158.

Not accepted by

  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Plectranthus chiangdaoensis.]
  • Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew. [Cited as Plectranthus chiangdaoensis.]

Literature

Kew Backbone Distributions

  • Paton, A.J., Mwanyambo, M. Govaerts, R.H.A., Smitha, K., Suddee, S., Phillipson, P.B., Wilson, T.C., Forster, P.I. & Culham, A. (2019). Nomenclatural changes in Coleus and Plectranthus (Lamiaceae): A tale of more than two genera PhytoKeys 129: 1-158.

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 Bulletin
Kew Bulletin
http://creativecommons.org/licenses/by-nc-sa/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