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This species is accepted, and its native range is Kenya to N. Malawi.
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: Tanzania, Lushoto District: Kwa Mshusa, Holst 8895 (G!, K!, Z!, iso.)
Morphology General Habit
Aromatic succulent straggling perennial herb
Morphology Stem
Stems procumbent, up to 1.5 m long, quadrangular, rooting at base, fleshy, brittle, sparsely branched, sometimes marked purple, sparsely pubescent with patent or retrorse hairs and scattered pale and red sessile glands, hairs becoming denser and sometimes glandular on the inflorescence axis
Morphology Leaves
Leaves succulent, spreading or ascending, ± sessile but attenuate base of blade petiole-like; blades elliptic, 2–8 × 0.8–5 cm, crenate, serrate to laciniate, acute at apex, attenuate at base, glabrous to pubescent, with red sessile glands
Morphology Reproductive morphology Inflorescences
Inflorescence terminal, with 6-flowered verticils 5–10 mm apart with bracts subtending 3-flowered, ± sessile cymes; bracts succulent, ± 10 mm long, obovate to obcordate, apex withered, brown, acute, with red sessile glands, pubescent with numerous glandular hairs and branched and unbranched eglandular hairs; pedicels 3–4 mm long, flattened, erect
Morphology Reproductive morphology Flowers Calyx
Calyx 4–6 mm long, pubescent with glandular hairs and red and pale sessile glands; fruiting calyx 6–9 mm long, spreading, tubular, with pedicel attached to the centre of the calyx base, basally circumscissile when fully mature; throat truncate, closed by convergent lobes of anterior lip pressing against posterior lip; posterior lip obovate, rounded or mucronate at apex, horizontal, not decurrent but with vein between posterior lip and lateral lobes conspicuous and raised; lateral lobes linear, apex truncate with small subulate tooth, median lobes lanceolate, subulate at apex
Morphology Reproductive morphology Flowers Corolla
Corolla blue, 13–19(–22) mm long, sparsely pubescent, with pale and red sessile glands on lobes; tube 8–11 mm long, straight and parallel-sided at base, sigmoid; posterior lip shorter than anterior; anterior lip 5–8 mm long, horizontal, deeply cucullate, enclosing stamens
Morphology Reproductive morphology Flowers Androecium Stamens
Staminal filaments fused
Morphology Reproductive morphology Fruits
Nutlets dark brown, minutely roughened with dark speckles, broadly ovoid, 1.5 mm long, producing speckled mucilage when wet.
Ecology
Exposed rocks with xerophytic vegetation, sometimes in in river gorges; 400–1300 m
Conservation
Least concern; (EOO 590158 km2, 18 collections from 17 localities; AOO 178040 km2 with cell width 112.7 km, number of cells 14, 6 subpopulations based on adjacent cells; 3 subpopulations based on Rapoport distance)
Distribution
Range: N Malawi Flora districts: K4 T2 T3 T4 T5 T6 T7

Native to:

Kenya, Malawi, Tanzania

Coleus coeruleus Gürke appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Holst, C. [8895], Tanzania Plectranthus coeruleus K000431988
Bidgood, S. [6201], Tanzania Plectranthus coeruleus K000468224

First published in Bot. Jahrb. Syst. 19: 217 (1894)

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 coeruleus.]
  • 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 coeruleus.]
  • 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 coeruleus.]

Literature

Kew Backbone Distributions

  • 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.

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