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This species is accepted, and its native range is 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, Mt Corva , Deschamps s.n. (B†, holo.; UPS, iso., K!, fragment)
Morphology General Habit
Aromatic annual viscid herb, 0.2–1 m tall
Morphology Stem
Stems erect or scandent, quadrangular, fleshy or leathery, woody at base, brittle, almost leafless when flowering, branching in inflorescence, pubescent with retrorse hairs and longer patent hairs at nodes, becoming more densely glandular and viscid on the inflorescence axis
Morphology Leaves
Leaves spreading or ascending, becoming yellowish and deflexed above, thinly fleshy, mostly deciduous before flowering, sessile; blades elliptic, 1.5–5 × 1–2 cm, becoming much smaller towards the inflorescence, entire or weakly serrate, sometimes weakly revolute, apex acute, base cuneate, pubescent, with pale sessile glands; leaf scar becoming excretory, attracting ants
Morphology Reproductive morphology Inflorescences
Inflorescence axillary and terminal with flowers arranged in a loose spiral with a single flower in between an opposite or subopposite pair, each bract subtending a single flower; bracts elliptic or lanceolate, 1–2 mm long; pedicels 6–20 mm long
Morphology Reproductive morphology Flowers Calyx
Calyx 2–3 mm long, sparsely pubescent with glandular hairs and pale sessile glands; fruiting calyx 4–5 mm long, shortly tubular with pedicel attached excentrically behind the posterior lip; throat truncate; posterior lip lanceolate to deltate, horizontal, not decurrent; lateral lobes of anterior lip similar, but slightly narrower than the posterior lip, median lobes subulate or narrowly lanceolate, longer than the lateral lobes, curving slightly upwards
Morphology Reproductive morphology Flowers Corolla
Corolla blue, 5–7 mm long, lobes with scattered hairs and pale sessile glands; tube 3–4 mm long, nearly straight or very shallowly sigmoid; posterior lip shorter than anterior; anterior lip 2–3 mm long, horizontal, cucullate enclosing stamens
Morphology Reproductive morphology Flowers Androecium Stamens
Staminal filaments fused, but posterior stamens sometimes almost free
Morphology Reproductive morphology Fruits
Nutlets brown with darker speckles, broadly ovoid, slightly flattened, 1–1.5 mm long, producing copious speckled mucilage when wet.
Ecology
Brachystegia-Uapaca woodland on sandy soil; 900–1050 m
Conservation
Least concern; widely distributed
Distribution
Range: Mali, Sierra Leone, Ghana, Nigeria, Cameroon, Congo-Kinshasa, Angola, Zambia, Malawi, Mozambique, Zimbabwe Flora districts: T4 T5 T6 T7 T8

[FWTA]

Labiatae, J. K. Morton. Flora of West Tropical Africa 2. 1963

Morphology General Habit
An erect, slender, branched, annual herb
Morphology Reproductive morphology Inflorescences
Racemes or panicles of small blue flowers borne on long slender pedicels
Note
Leafless when in fruit.

Native to:

Angola, Benin, Burkina, Cabinda, Cameroon, Central African Repu, Chad, Congo, Ghana, Ivory Coast, Malawi, Mali, Mozambique, Niger, Nigeria, Senegal, Sierra Leone, Sudan, Tanzania, Togo, Zambia, Zaïre, Zimbabwe

Coleus gracillimus (T.C.E.Fr.) Robyns & Lebrun appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 2009 Bingham [12751], Zambia Plectranthus gracillimus K000735879
Jan 1, 2009 Bingham [12684], Zambia Plectranthus gracillimus K000735880
Mar 1, 2000 Zapfack, L. [1101], Cameroon Plectranthus gracillimus K000339264
Mar 1, 2000 Etuge, M. [3573], Cameroon Plectranthus gracillimus K000339265
Descamps [s.n.], Congo Plectranthus gracillimus K000431868 Unknown type material
Stolz, A. [1440], Tanzania Plectranthus gracillimus K000431962 Unknown type material
Gossweiler, J. [11165], Angola Plectranthus gracillimus K001008926
Stolz, A. [1440], Tanzania Plectranthus gracillimus K000431961
Barter, C. [s.n.], Nigeria Plectranthus gracillimus K000431860 Unknown type material
Zambia Englerastrum diffusum 2745.000
Milne-Redhead, E. [10473], Tanzania Englerastrum gracillimum 27335.000
s.coll. [458], Burkina Faso Englerastrum gracillimum K000385923
Schlechter [12240], Mozambique Plectranthus schlechteri K000430750 Unknown type material
Ward, C.J. [7833], Mozambique Plectranthus schlechteri K000430751

First published in Ann. Soc. Sci. Bruxelles, Sér. B 49: 106 (1929)

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 gracillimus.]
  • 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 gracillimus.]

Literature

Kew Backbone Distributions

  • Akoègninou, A., van der Burg, W.J. & van der Maesen, L.J.G. (eds.) (2006). Flore Analytique du Bénin: 1-1034. Backhuys Publishers.
  • Berhaut, J. (1975). Flore illustrée du Sénégal 4: 1-625. Gouvernement du Sénégal, Ministère du développement rural direction des eaux et forêta, Dakar.
  • Boulvert, Y. (1977). Catalogue de la Flore de Centrafrique 2(1): 1-85. ORSTOM, Bangui.
  • Brunel, J.F., Hiepo, P. & Scholz, H. (eds.) (1984). Flore Analytique du Togo Phanérogames: 1-751. GTZ, Eschborn.
  • Calane da Silva, M., Izdine, S. & Amuse, A.B. (2004). A Preliminary Checklist of the Vascular Plants of Mozambique: 1-184. SABONET, Pretoria.
  • Darbyshire, I., Kordofani, M., Farag, I., Candiga, R. & Pickering, H. (eds.) (2015). The Plants of Sudan and South Sudan: 1-400. Kew publishing, Royal Botanic Gardens, Kew.
  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
  • Lebrun, J.-P., Audru, J., Gaston, A. & Mosnier, M. (1972). Catalogue des Plantes Vasculaires du Tchad Méridional: 1-289. Institut d' Elevage et de Médecine Vétérinaire des Pays Tropicaux, Maisons Alfort.
  • Lebrun, J.P., Toutain, B., Gaston, A. & Boudet, G. (1991). Catalogue des Plantes Vasculaires du Burkina Faso: 1-341. Institut d' Elevage et de Médecine Vétérinaire des Pays Tropicaux, Maisons Alfort.
  • 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.
  • Peyre de Fabregues, B. & Lebrun, J.-P. (1976). Catalogue des Plantes Vascularies du Niger: 1-433. Institut d' Elevage et de Médecine Vétérinaire des Pays Tropicaux, Maisons Alfort.
  • Sita, P. & Moutsambote, J.-M. (2005). Catalogue des plantes vasculaires du Congo, ed. sept. 2005: 1-158. ORSTOM, Centre de Brazzaville.

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

Flora of West Tropical Africa
Flora of West Tropical 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