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This species is accepted, and its native range is SW. Tanzania to E. Zambia.
A specimen from Kew's Herbarium


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

Typus: Tanzania, Rungwe District: Ngozi, Geilinger 2884 (K!, holo.)
Morphology General Habit
Annual or short-lived perennial herb 0.5–2.5 m tall, not or weakly aromatic
Morphology Stem
Stems erect, quadrangular, sparsely branched, pubescent with patent glandular and eglandular hairs and scattered red sessile glands
Morphology Leaves
Leaves spreading or ascending, petiolate; blades triangular to ovate, (2–)3–7 × (1.5–)2–5 cm, serrate, apex acuminate, base truncate to shallowly cordate, pubescent or sparsely so, with red sessile glands; petioles (1–)3–7 cm long
Morphology Reproductive morphology Inflorescences
Inflorescence lax with 5–14-flowered opposite cymes; cymes lax, cincinnate or pedunculate with first branch dichasial and producing two lateral cincinni, 15–30 mm long in fruit; peduncle 3–5 mm long if present; bracts ± 1 mm long, deciduous; pedicels 6 mm long in fruit
Morphology Reproductive morphology Flowers Calyx
Calyx 3–4 mm long, pubescent, with red sessile glands; fruiting calyx ascending, 10–12 mm long, tubular, straight and with pedicel attached excentrically behind posterior lip; throat truncate; posterior lip obovate, rounded to obtuse at apex, horizontal or slightly accrescent, shortly or not decurrent; lobes of anterior lip ± equal, lanceolate, apex acute
Morphology Reproductive morphology Flowers Corolla
Corolla white marked violet, 12–18 mm long, ± glabrous with red sessile glands; tube 5–6 mm long, sigmoid; posterior lip shorter than anterior; anterior lip 7–12 mm long, shallowly cucullate enclosing stamens
Morphology Reproductive morphology Flowers Androecium Stamens
Staminal filaments fused
Morphology Reproductive morphology Fruits
Nutlets brown with reddish dots, broadly ovoid, slightly flattened, 1.5 mm long, not secreting mucilage.
Evergreen forest patches; 2200–2400 m
Near threatened; (EOO 40389.3 km2, 12 collections from 11 localities; AOO 15527 km2 with cell width 47.1 km, number of cells 7, 5 subpopulations based on adjacent cells; 3 subpopulations based on Rapoport distance)
Range: E Zambia and N Malawi Flora districts: T7

Native to:

Malawi, Tanzania, Zambia

Coleus megacalyx (A.J.Paton) A.J.Paton appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Geilinger [2884], Tanzania Plectranthus megacalyx K000431978 holotype

First published in PhytoKeys 129: 72 (2019)

Accepted by

  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. Scientific Data 8: 215.


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

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at and
© Copyright 2017 World Checklist of Selected Plant Families.

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at and
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families.