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This species is accepted, and its native range is Peninsula Thailand (Phang-nga).


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

Collected once in 1896 in an area near habitation. Recent field work in December 1999 failed to find any populations from the recorded locality or nearby.
Endemic to Peninsular Thailand. Known only from the type.
On limestone rocks.
Morphology General Habit
Ascending perennial herbs up to 20 cm tall
Morphology Leaves
Leaves thick, early-caducous, ovate or elliptic, 30 - 80 x 20 - 35 mm, apex acute, base cuneate, margin serrate- crenate, pubescent above, tomentose with sessile glands beneath; petioles 5 - 15 mm long, tomentose
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens free, posterior pair attached slightly below anterior, included in anterior corolla lip
Morphology Reproductive morphology Flowers Calyx
Calyx campanulate, 2 - 2.5 mm long at anthesis, 4- 6 mm long in fruit; posterior lip broadly ovate, acute at apex, margin entire, bent backwards, decurrent on tube, glabrous with conspicuous veins on both sides; anterior lip with teeth lanceolate, median teeth united more than half of their length, subequal in length to posterior, lateral teeth shorter; tube 10-nerved, glabrescent to pubescent with sessile glands outside, saccate at anterior base
Morphology Reproductive morphology Flowers Corolla
Corolla (colour unknown), 7 - 10 mm long; posterior lip pubescent with sessile glands on back, median lobes rounded at apex, larger than the obtuse lateral lobes; anterior lip oblong, 3 - 4 mm long, concave, slightly pubescent along margin inside, pubescent with sessile glands outside; tube 5 - 7 mm long, sigmoid below the middle, gradually dilated towards throat, slender below, pubescent with sessile glands outside
Morphology Reproductive morphology Flowers Disc
Disc with anterior side largest, truncate at apex, equal to or exceeding ovary
Morphology Reproductive morphology Flowers Gynoecium Style
Style slightly cleft at apex with pointed branches, slightly exceeding anterior stamens but not exceeding anterior corolla lip
Morphology Reproductive morphology Fruits
Nutlets black, ovoid or ellipsoid, subtrigonous, 1 - 1.2 mm long, smooth, not producing mucilage when wet.
Morphology Reproductive morphology Inflorescences
Inflorescence terminal, simple, 9 - 12 cm long; axis densely pubescent with patent and antrose hairs; verticils 5 - 15 mm apart, clearly interrupted; cymes sessile, 2 - 3-flowered; bracts sessile, early caducous, ovate, 3- 5 mm long, acuminate, pubescent; pedicels 1 - 2 mm long at anthesis, 2 - 3.5 mm long in fruit, pubescent
Morphology Stem
Stems stout and woody at base, with conspicuous kidney- shaped leaf scars, quadrangular, puberulous
The closest species is Plectranthus kunstleri Prain; both have similar leaf shape and grow on limestone rocks, but Plectranthus tomentifolius differs in having an unbranched inflorescence with 2 - 3-flowered cymes (branched with a single flower in P. kunstleri). The leaves of P. kunstleri are membranous and pubescent while they are rather thick and tomentose in P. tomentifolius.
Flowering & fruiting November (ex type).
Thailand, Takua Thung, Nov. 1896, Curtis s.n. (holotypus SING!).

Extinct in:


Coleus tomentifolius (Suddee) Suddee appears in other Kew resources:

First published in PhytoKeys 129: 106 (2019)

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. Scientific Data 8: 215.

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at and
© Copyright 2017 World Checklist of Selected Plant Families.

Kew Bulletin
Kew Bulletin

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at and
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families.