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This species is accepted, and its native range is Eritrea to S. Africa, India to Myanmar.
A specimen from Kew's Herbarium

[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

Distribution
Tropical Africa, India and Burma, sometimes cultivated.
Ecology
In scrub forest, rocky places; 50 - 700 m.
Morphology General Habit
Erect or ascending annual herbs up to 50 cm tall
Morphology Leaves
Leaves fleshy, obovate, 15 - 45 x 10 - 30 mm, apex rounded, base cuneate or attenuate and decurrent on petiole, margin crenate, puberulous to pubescent with scattered sessile glands both sides, veins obscure; petioles 3 - 10 mm long, pubescent
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens united for half of their length, exserted beyond anterior corolla lip
Morphology Reproductive morphology Flowers Calyx
Calyx campanulate, 3 - 4 mm long at anthesis, 4 - 5 mm long in fruit; posterior lip shortly and broadly obovate, apiculate or subtruncate at apex, margin shortly ciliate, slightly decurrent on tube, glabrous or glabrescent with conspicuous nerves inside, pubescent with scattered sessile glands outside; anterior lip ± equal in length to posterior, lateral teeth triangular-ovate, median teeth lanceolate, all teeth with margin shortly ciliate; tube 10 - 12-nerved, pubescent, with sessile glands outside, hairs denser at tube base, with a ring of dense white hairs inside throat, scarcely saccate at anterior base
Morphology Reproductive morphology Flowers Corolla
Corolla purple, 10 - 12 mm long; posterior lip sparsely pubescent on back, median lobes rounded at apex, much larger than the acute lateral lobes; anterior lip ovate-oblong, 4 - 5 mm long, concave, glabrous inside, sparsely pubescent with sessile glands outside; tube 4 - 5 mm long, sigmoid below the middle, slightly dilated at base, widely expanded at throat, glabrous outside
Morphology Reproductive morphology Flowers Disc
Disc with anterior side obtuse at apex, not exceeding ovary
Morphology Reproductive morphology Flowers Gynoecium Style
Style clavate at apex, shortly bifid with equal branches, subequal to anterior stamens
Morphology Reproductive morphology Fruits
Nutlets ovoid or ellipsoid, c. 1 mm long, black, smooth and shining, only slightly producing mucilage when wet.
Morphology Reproductive morphology Inflorescences
Inflorescence terminal, simple, spike-like; adjacent verticils touching, rarely separated below, 30 - 150 x 10 - 12 mm; cymes sessile, 3-flowered; bracts membranous, sessile, caducous, broadly ovate, 5 - 6 x 6- 7 mm, acute, shortly ciliate, pubescent; pedicels 2 - 3 mm long at anthesis, 3 - 4 mm long in fruit, pubescent
Morphology Stem
Stems succulent, branched, sometimes rooting at nodes, round-quadrangular, softly pubescent with white patent hairs
Note
Roth based his description of Ocimum monadelphum on Heyne's specimen and 'Plectranthus monadelphus Heyne' MSS. The type at B was destroyed. The neotype is chosen here from Herb. Ham. (K-W), and is a cultivated plant from the Botanic Garden Calcutta, which corresponds well with 'Plectranthus monadelphus' MSS. Heyne's and Hamilton's specimens were probably collected from the same cultivated plant but this cannot be proved so a neotype is chosen.
Phenology
Flowering & fruiting December - February.
Type
India, Heyne s.n. in Wallich Cat. 2729C (holotype B, destroyed; isotype K-W!).

[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
Type: India, Heyne s.n. in Wallich Cat. 2729C (B†, holo.; K-W!, iso.)
Morphology General Habit
Aromatic perennial or sometimes annual succulent herb 0.1–0.6 m tall, with stems arising from a branched taproot
Morphology Stem
Stems sprawling to erect, softly wooded at base or not, branching to form clumps or more laxly branched, pubescent to villose with short retrorse glandular hairs and usually patent glandular and eglandular hairs, becoming more glandular on the inflorescence axis and with red sessile glands
Morphology Leaves
Leaves fleshy, spreading to ascending, often folded along midrib on drying, sometimes with fascicles of leaves in axils, petiolate or sometimes indistinctly so due to attenuate leaf base; blades ovate-elliptic or oblong, 2–6 × 1–2(–2.5) cm, crenate to serrate, weakly revolute, apex obtuse to rounded, base attenuate, pubescent with eglandular and glandular hairs and with red sessile glands; petiole 3–10 mm long
Morphology Reproductive morphology Inflorescences
Inflorescence condensed with adjacent 6-flowered verticils touching in fruit; cymes 3-flowered, sessile; bracts ovate or broadly ovate, 5–15 mm long, apiculate and often coiled at apex, green or white, purplish distally, erect above forming a conspicuous or inconspicuous terminal coma, cucullate enclosing buds, soon deciduous or persistent; pedicels 2 mm long, erect, flattened, curved distally, slightly winged at base
Morphology Reproductive morphology Flowers Calyx
Calyx 3–5 mm long, densely pubescent, with red and colourless or yellowish sessile glands; fruiting calyx 4–7 mm long, shortly tubular and with pedicel attached excentrically behind posterior lip; throat truncate, densely villose; posterior lip broadly obovate, mucronate at apex, curving upwards, not decurrent; anterior lip 4lobed, lobes lanceolate with median narrower
Morphology Reproductive morphology Flowers Corolla
Corolla blue or purple marked white, 6–14 mm long, with scattered red glands on lobes and tube or not; tube 3–6 mm long, sigmoid; posterior lip shorter than anterior lip; anterior lip 2–8 mm long, horizontal, cucullate, enclosing stamens
Morphology Reproductive morphology Flowers Androecium Stamens
Staminal filaments fused
Morphology Reproductive morphology Fruits
Nutlets dark grey, with dark gland dots, broadly ovoid, slightly flattened, 1–1.5 mm long, smooth, producing copious speckled mucilage when wet.

Native to:

Angola, Botswana, Burundi, Eritrea, Ethiopia, India, Kenya, Myanmar, Namibia, Northern Provinces, Rwanda, Somalia, Sudan, Tanzania, Uganda, Zambia, Zaïre, Zimbabwe

Introduced into:

Malaya, New Guinea

Coleus caninus (B.Heyne ex Roth) Vatke appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 1991 Mooney, H.F. [7672], Somalia Plectranthus caninus K000431897 neotype
Bridson, D. [255], Rwanda Plectranthus caninus 41715.000
Ash [516], Ethiopia Plectranthus caninus 42934.000
Mathew, B. [6014], Kenya Plectranthus caninus 6049.219
s.coll. [s.n.], India Plectranthus caninus K000820143 isoparatype
Wight [s.n.], India Plectranthus caninus K000820144
Bidgood, S. [BO/11], Botswana Plectranthus caninus K000823855
Wight [s.n.], Tamil Nadu Plectranthus caninus K000820141 syntype
Wight [s.n.], Tamil Nadu Plectranthus caninus K000820139 syntype
Heyne, B. [s.n.], India Plectranthus caninus K000820142
Heyne, B. [s.n.], India Plectranthus caninus K000820140

First published in Linnaea 37: 318 (1872)

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 caninus.]
  • 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 caninus.]

Literature

Kew Backbone Distributions

  • Bramley, G.L.C. (2019). Flora Malesiana 23: 1-444. Noordhoff-Kolff N.V., Djakarta.
  • Paton, A.J., Bramley, G., Ryding, O., Polhill, R., Harvey, Y., Iwarsson, M., Willis, F., Phillipson, P., Balkwill, K., Lukhoba, C., Otiend, D & Harley (2009). Lamiaceae (Labiatae) Flora of Tropical East Africa: 1-430.
  • Paton, A.J., Bramley, G., Ryding, O., Polhill, R.M., Harvey, Y.B., Iwarsson, M., Otieno, D., Balkwill, K., Phillipson, P.B., Harley, R.M. & Willis, F. (2013). Flora Zambesiaca 8(8): 1-346. Royal Botanic Gardens, Kew.
  • Thulin, M. (ed.) (2006). Flora of Somalia 3: 1-626. The Royal Botanic Gardens, Kew.

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 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