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This species is accepted, and its native range is Ethiopia to S. Tropical Africa.
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
Type: Congo-Kinshasa, Kasai, Mayumbe, Dupuis s.n. (BR!, holo.)
Morphology General Habit
Aromatic perennial herbs or shrubs, (0.1–)0.4–1(–2) m tall, arising from a woody rootstock
Morphology Stem
Stems erect, ascending or spreading, sometimes creeping at base and rooting adventitiously, quadrangular, branched or unbranched, sometimes marked purplish below, purplish above, pubescent with retrorse and patent eglandular hairs, very rarely sericeous, puberulent to pubescent on the inflorescence axis with sometimes purplish hairs and with scattered red sessile glands
Morphology Leaves
Leaves petiolate, often spoon-shaped and with clusters of young leaves or shoots in axils; blades sometimes marked purplish or sometimes grey, fleshy, triangular, ovate or trullate, (0.5–)1–6(–7) × (0.5–)1–3(–5) cm, crenate to serrate, sometimes weakly revolute, apex obtuse to rounded, rarely acute, base cuneate to truncate, but strongly attenuate to decurrent at petiole, pubescent to sericeous, with reddish sessile glands; petiole 5–20 mm long but leaves sometimes appearing subsessile due to attenuate base
Morphology Reproductive morphology Inflorescences
Inflorescence usually lax, sometimes condensed in flower with 10–30-flowered verticils 10–30 mm apart in fruit; cymes sessile (3–)5–15-flowered with lateral cincinni to 10–20 mm long; bracts erect above, slightly cucullate, 2–6 mm long, soon becoming deflexed and deciduous, often very inconspicuous; pedicels 2–4(–5) mm long
Morphology Reproductive morphology Flowers Calyx
Calyx 2 mm long, pubescent, with red sessile glands; fruiting calyx 4–6 mm long, tubular, slightly constricted at throat, slightly curved with pedicel attached excentrically behind the posterior lip; throat truncate; posterior lip elliptic, curving upwards, acute at apex, not or shortly decurrent, lateral lobe rounded, oblong, median lobes of the anterior lip linear, equal or just exceeding posterior lobe, 2.5–5 mm long with teeth 0.5–1 mm long
Morphology Reproductive morphology Flowers Corolla
Corolla blue, (5–)7–15 mm long, pubescent on lobes, with red sessile glands; tube(2–)3–6 long, sigmoid, sigmoid portion not concealed; posterior lip erect or reflexed, shorter than anterior; anterior lip 3–9 mm long, cucullate enclosing stamens
Morphology Reproductive morphology Flowers Androecium Stamens
Staminal filaments fused
Morphology Reproductive morphology Fruits
Nutlets brown specked reddish, ovoid, 1 mm long, producing a small amount of mucilage.
Ecology
Grassland or woodland, often among rocks, also reported from seasonally flooded areas and in cultivation; 900–2200 m, down to 100–500 m at coast and up to 3000 m in K 3
Conservation
Least concern; widely distributed
Note
The following is also possibly a synonym: C. eetveldeanus Briq. in B.S.B.B. 37: 73 (1898); Baker in F.T.A. 5: 442 (1900); type: Congo-Kinshasa, Lake Tanganyika, Mtowa, Deschamps s.n. (BR!, holo.). The type specimen does not allow certain placement, but the calyx is longer than that of P. latifolius. The corollas are short, but these are very immature. Polhill 204 from K 3, Elburgon District: is anomalous in having laciniate leaves, very small flowers and growing at high altitude (3000 m). Collections from T 4 sometimes have a sericeous indumentum and strongly discolorous leaves but there is no clear discontinuity: for example, Newbould 5871 from Ngorongoro Crater wall is intermediate. P. dupuisii is said to be poisonous to goats and sheep. P. scutellarioides (L.) R. Br. ( Coleus blumei Benth.) from tropical Asia is similar and is widely cultivated for its brightly coloured and variegated, sometimes incised leaves. Also differs from P. dupuisii in having a calyx typically 6–7 mm long and a fibrous root system.
Distribution
Range: Congo-Kinshasa, Rwanda, Burundi, Sudan, Ethiopia, Angola, Zimbabwe and South Africa Flora districts: U1 U2 U3 U4 K3 K4 K5 K6 K7T1 T2 T3 T4 T5 T6 T7 T8

Native to:

Angola, Burundi, Ethiopia, Kenya, Rwanda, Sudan, Tanzania, Uganda, Zaïre, Zimbabwe

Coleus welwitschii Briq. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jun 1, 2013 Robertson [7495], Kenya Plectranthus dupuisii K000938037
May 24, 2013 Wieringa [1094], Gabon Plectranthus dupuisii K000735956
Gossweiler, J. [10037], Angola Plectranthus dupuisii K000070376
Barbosa, G. [9562], Angola Plectranthus dupuisii K000070378
Santos, R. [604], Angola Plectranthus dupuisii K000070375
Gossweiler, J. [9743], Angola Plectranthus dupuisii K000070379
Gossweiler, J. [2524], Angola Plectranthus dupuisii K000070374
Henriques, C. [285], Angola Plectranthus dupuisii K000070377
Couto, C. [303], Angola Plectranthus dupuisii K000070373

First published in Bot. Jahrb. Syst. 19: 185 (1895)

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 Unplaced Name.]
  • 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 Unplaced Name.]
  • 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. [Cited as Plectranthus dupuisii.]

Literature

Kew Backbone Distributions

  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
  • 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.

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