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This species is accepted, and its native range is SE. Kenya to E. Tanzania.
A specimen from Kew's Herbarium

[FTEA]

Lamiaceae (Labiatae), A.J. Paton, G. Bramley, O. Ryding, R.M. Polhill, Y.B. Harvey, M. Iwarsson, F. Willis, P.B. Phillipson, K. Balkwill, C.W. Lukhoba, D.F. Otieno, & R.M. Harley. Flora of Tropical East Africa. 2009

Type
Typus: Kenya, Teita District: Ngangao Forest, Luke et al. 5497 (K!, holo. EA!, iso.)
Morphology General Habit
Perennial herb, 0.2–0.4 m tall, sometimes carpet-forming, not reported to be aromatic
Morphology Stem
Stems decumbent to ascending, rooting at lower nodes with inflorescences erect, quadrangular, slightly succulent, puberulent below, becoming pubescent with patent eglandular and glandular hairs on the inflorescence axis and with red sessile glands
Morphology Leaves
Leaves ascending or spreading, petiolate; blades triangular-ovate, 1.2–4(–4.5) × 1.2–4(–5) cm, serrate, apex acute, base broadly cuneate, attenuate at petiole, glabrous, with red sessile glands; petiole 1–5.5 cm long
Morphology Reproductive morphology Inflorescences
Inflorescence lax with 5–10flowered opposite cymes 20–30 mm apart; cymes lax, shortly pedunculate with the first branch diachasial producing 2 lateral cincinni or, more rarely, cincinnate throughout, 15–20 mm long in fruit; peduncle 1–7 mm long if present; bracts ± 1 mm long, deciduous; pedicel 4 mm long
Morphology Reproductive morphology Flowers Calyx
Calyx ascending, 2–4 mm long, pubescent, with red sessile glands; fruiting calyx ascending, 6–9 mm long, tubular, straight and with pedicel attached excentrically behind posterior lip; throat truncate; posterior lip oblong to obovate, rounded at apex, horizontal or slightly curving upwards, shortly decurrent; lobes of anterior lip ± equal, lanceolate, apex acute
Morphology Reproductive morphology Flowers Corolla
Corolla white or bluish-white, (9–)11–12(–14) mm long, glabrous or sparsely pubescent on lobes, with scattered red sessile glands; tube 4–5 mm long, sigmoid or strongly so; posterior lip shorter than anterior; anterior lip (5–)6–7(–10) mm long, horizontal, cucullate enclosing stamens
Morphology Reproductive morphology Flowers Androecium Stamens
Staminal filaments fused
Morphology Reproductive morphology Fruits
Nutlets dark brown, ovoid, slightly flattened, 1.5 mm long
Figures
Fig 54: 5, p 314
Ecology
Wet evergreen forest, frequently with Ocotea and Podocarpus; 1500–2300 m
Conservation
Least concern; can grow on paths and disturbed areas exploited for logging; (EOO 33452.9 km2, 25 collections from 22 localities; AOO 22399.6 km2 with cell width 43.2 km, number of cells 12, 4 subpopulations based on adjacent cells; 4 subpopulations based on Rapoport distance)
Note
Thulin & Mhoro 1037, Uluguru Mts, Lukwangulu Plateau (the most southerly collection), differs from others by being a more substantial plant with larger corollas (14 mm long) and with a deeper anterior lip.
Distribution
Range: Not known elsewhere Flora districts: T3 T6 K 7 (Taita Hills)

Native to:

Kenya, Tanzania

Coleus triangularis (A.J.Paton) A.J.Paton appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jun 1, 2013 Festo [2041], Tanzania Plectranthus triangularis K000938028
Jun 1, 2013 Mwangoka, M.A. et al. [3578], Tanzania Plectranthus triangularis K000938029
Jun 1, 2013 Luke [10806], Kenya Plectranthus triangularis K000938030
Jan 1, 2013 Mwangoka, M.A. et al. [3431], Tanzania Plectranthus triangularis K000938025
Luke [5497], Kenya Plectranthus triangularis K000431976 holotype

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. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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