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This species is accepted, and its native range is Kenya to S. Africa.
Plectranthus tetragonus Gurke

[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
Morphology General Habit
Aromatic annual herb, 0.2–0.5 m tall
Morphology Stem
Stems erect or scandent, quadrangular, fleshy or leathery, woody at base, leafless or with few leaves when flowering, laxly branching; with long patent lignified bristles and retrorse short hairs, becoming viscid with short patent glandular hairs in the inflorescence
Morphology Leaves
Leaves spreading or ascending, becoming deflexed above, thinly fleshy, mostly deciduous before flowering, sessile; blades ovate or rhombic, sometimes becoming rolled up, 2–9 × 1.5–5 cm, subentire or weakly serrate, sometimes weakly revolute, apex obtuse or acute, base attenuate, pubescent, with brownish sessile glands
Morphology Reproductive morphology Inflorescences
Inflorescence with flowers arranged in a rough spiral without any other pattern apparent, adjacent flowers sometimes subopposite, each bract subtending a single flower; bracts elliptic, 1 mm long; pedicels 5–8 mm long
Morphology Reproductive morphology Flowers Calyx
Flowering calyx 3–4 mm long, sparsely pubescent with glandular hairs and pale sessile glands; fruiting calyx 6–10 mm long tubular, slightly curved with pedicel attached excentrically behind the posterior lip; throat truncate; posterior lip obovate, mucronate, curving slightly upwards, shortly decurrent; lateral lobes of anterior lip lanceolate, median lobes narrowly lanceolate, longer than the lateral lobes, curving slightly upwards
Morphology Reproductive morphology Flowers Corolla
Corolla yellow, 5–7 mm long, lobes with brownish sessile glands; tube 3–4.5 mm long, shallowly sigmoid to almost straight, slightly dorsally gibbous, dilating towards throat; posterior lip shorter than anterior; anterior lip 2 mm long, cucullate enclosing stamens
Morphology Reproductive morphology Flowers Androecium Stamens
Staminal filaments fused
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
Rocky ground, Acacia- Commiphora bushland; 600–1800 m, down to 80 m in K 7
Conservation
Least concern; (EOO 1.87 × 106 km2, 38 collections from 37 localities; AOO 1.09 × 106 km2 with cell width 245.87 km, number of cells 18, 2 subpopulations based on adjacent cells; 5 subpopulations based on Rapoport distance)
Distribution
Range: Congo-Kinshasa, Zambia, Malawi and Zimbabwe Flora districts: K 4/K6 K7 T3 T5 T6 T7

Native to:

Botswana, Kenya, Malawi, Mozambique, Namibia, Northern Provinces, Swaziland, Tanzania, Zambia, Zaïre, Zimbabwe

Coleus tetragonus (Gürke) Robyns & Lebrun appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 2011 Heath [1630], Botswana Plectranthus tetragonus K000249827
Fischer [511], Tanzania Plectranthus tetragonus K000431963 Unknown type material
Bidgood, S. [6212], Tanzania Plectranthus tetragonus K000468213
Bidgood, S. [5997], Tanzania Plectranthus tetragonus K000468428
Bidgood, S. [6004], Tanzania Plectranthus tetragonus K000468421
Holst, C. [3573], Tanzania Plectranthus tetragonus K000431964 Unknown type material
Whyte, A. [s.n.], Malawi Plectranthus biflorus K000430791 Unknown type material

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

Not accepted by

  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Plectranthus tetragonus.]
  • 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 tetragonus.]
  • 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 tetragonus.]

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.
  • van Jaarsveld, E. (2006). The Southern African Plectranthus and the art of turning shade to glade: 1-176. Ferwood Press, Simon's Town, South Africa.

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

Plants and People Africa
Common Names from Plants and People Africa http://www.plantsandpeopleafrica.com/
© Plants and People Africa http://www.plantsandpeopleafrica.com http://creativecommons.org/licenses/by/3.0/