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This species is accepted, and its native range is SW. Tanzania to Zambia.
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: Zambia, Mbala District: Tanganyika Plateau, 1889, Carson s.n. (K!, holo.)
Morphology General Habit
Perennial herb with a 1–few stems arising from a branching tuberous root system, 0.2–0.4 m tall, not reported as aromatic.
Morphology Roots
Roots terminating in small, 10–15 mm long tubers
Morphology Stem
Stems erect, quadrangular, slightly succulent, sparsely branched, terminating in a sterile leafy portion, glabrous or more rarely pubescent with patent hairs, becoming more densely pubescent with patent glandular hairs on the inflorescence axis
Morphology Leaves
Leaves ascending, often clasping stem, sessile; blades oblong or obovate, 1.2–5 × 0.3–1 cm, margin slightly thickened, crenate or serrate distally, apex rounded, base cuneate to truncate, glabrous or with scattered hairs, glandular-punctate with pale sessile glands
Morphology Reproductive morphology Inflorescences
Inflorescence axillary, but overtopping stem apex, with flowers single, very rarely with some 2-flowered pedunculate cymes, secund, clustered towards the end of the axis, up to 15 mm apart, inserted oppositely, suboppositely or alternately in no particular pattern; bracts elliptic, 1–2 mm long; pedicels 4–6 mm long
Morphology Reproductive morphology Flowers Calyx
Calyx 3–4 mm long, densely pubescent with glandular hairs and sessile glands; fruiting calyx 5–7 mm long, tubular, slightly curved, with pedicel attached centrally at base of calyx; throat truncate; posterior lip obovate, acute at apex, not decurrent, curving slightly upwards; lobes of anterior lip lanceolate, median longer than lateral lobes
Morphology Reproductive morphology Flowers Corolla
Corolla bright blue, 9–14 mm long; tube 6–7 mm long, ± straight at base, bending downwards distally, parallel-sided at base, becoming dorsally gibbous at midpoint, dilating slightly towards throat, with flat papillae within arising from the posterior stamen trace near base and sticking up into the dorsally gibbous portion of the tube; posterior lip ± equal to or a little shorter than anterior; anterior lip 3–6 mm long, densely ciliate on margin with bluish hairs, deeply cucullate, enclosing stamens
Morphology Reproductive morphology Flowers Androecium Stamens
Staminal filaments fused
Morphology Reproductive morphology Flowers Gynoecium Style
Style shortly bifid
Morphology Reproductive morphology Fruits
Nutlets dark brown with darker speckles, broadly ovoid, 1 mm long, slightly roughened, producing copious brown speckled mucilage when wet
Figures
Fig 50, p 282
Ecology
Montane grassland, edge of Brachystegia woodland, edge of dambos, wet places often on rich dark soil; 1500–2400 m
Conservation
Least concern; (EOO 1.04 × 106 km2, 31 collections from 23 localities; AOO 327114 km2 with cell width 180.86 km, number of cells 10, 5 subpopulations based on adjacent cells; 5 subpopulations based on Rapoport distance)
Note
Close to P. adenophorus on account of single-flowered, regularly arranged cymes and terminal sterile stem portion, differing in having longer ascending, oblong to obovate leaves, rather than spreading to deflexed elliptic leaves, a less divided style, and having appendages rather than an annulus at the corolla base.
Distribution
Range: Zambia and Malawi Flora districts: T4 T7

Native to:

Malawi, Tanzania, Zambia

Coleus modestus (Baker) Robyns & Lebrun appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Cruse, A.W. [440], Zambia Plectranthus modestus 21927.000
Carson, A. [s.n.], Malawi Plectranthus modestus K000430767 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 modestus.]
  • 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 modestus.]
  • 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 modestus.]
  • 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. [Cited as Plectranthus modestus.]

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