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This species is accepted, and its native range is Ethiopia (Bale Prov.), DR Congo, Tanzania, NW. Madagascar.
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
Types: Congo-Kinshasa, Buta to Bima [Bali], Seret 68 (BR!, syn.) & Suronga Forest, Seret 420 [wrongly cited as 120 in protologue] (BR!, syn. K!, isosyn.)
Morphology General Habit
Annual herb ± 1 m tall, not reported to be aromatic
Morphology Stem
Stems ascending, quadrangular, sparsely pubescent below with scattered woody bristles and with scattered red sessile glands; hairs becoming denser and sometimes glandular on the inflorescence axis
Morphology Leaves
Leaves thin textured, ascending, petiolate; blades ovate, 5–12 × 3.5–10 cm, double serrate, apex acute, base cuneate, attenuate at petiole, glabrous or with very few scattered hairs and with red sessile glands; petiole 2–10 cm long
Morphology Reproductive morphology Inflorescences
Inflorescence lax with 5–12-flowered opposite cymes 10–20 mm apart; cymes lax, shortly pedunculate or sessile with the first branch diachasial producing 2 lateral cincinni, 10–15 mm long in fruit; peduncle 0–1 mm long if present; bracts ± 3 mm long, deciduous; pedicel 2–3 mm long, slightly flattened
Morphology Reproductive morphology Flowers Calyx
Calyx ascending, 2–3 mm long, pubescent, with red sessile glands; fruiting calyx ascending, 6–8 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, not or scarcely decurrent; lobes of anterior lip ± equal, lanceolate, apex acute
Morphology Reproductive morphology Flowers Corolla
Corolla violet, 7–9 mm long, sparsely pubescent on lobes, with scattered red sessile glands; tube 5–6 mm long, sigmoid or strongly so; posterior lip shorter than anterior; anterior lip 2–3 mm long, horizontal, cucullate enclosing stamens
Morphology Reproductive morphology Flowers Androecium Stamens
Staminal filaments fused
Morphology Reproductive morphology Fruits
Nutlets dark brown, broadly ovoid, 1 mm long, flattened
Figures
Fig 54: 1–4, p 314
Ecology
Lowland forest, wet areas; 150–850 m
Conservation
Least concern; widely distributed
Note
Differs from P. triangularis by having woody bristles on the stems, larger leaves and a smaller corolla with a much smaller anterior lip.
Distribution
Flora districts: T3 T4 T6 T8 Range: Congo-Kinshasa, Ethiopia and Madagascar

Native to:

Ethiopia, Madagascar, Tanzania, Zaïre

Coleus seretii De Wild. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Seret, F. [420], Congo, DRC Plectranthus seretii K000431881

First published in Bol. Soc. Ibér. Ci. Nat. 19: 122 (1920)

Not accepted by

  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Plectranthus seretii.]
  • 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 seretii.]
  • Hedberg, I., Kelbessa, E., Edwards, S., Demissew, S. & Persson, E. (eds.) (2006). Flora of Ethiopia and Eritrea 5: 1-690. The National Herbarium, Addis Ababa University, Ethiopia & The Department of Systematic Botany, Upps. [Cited as Plectranthus seretii.]
  • 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 seretii.]

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.

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