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This species is accepted, and its native range is Rwanda to S. Tropical Africa.

[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: Mozambique, Mar. 1845, Peters s.n. (B†, holo.) Sebald cites the following isotypes: Rios de Sena, 1846, Peters s.n . (JE) Peters s.n. (COI, Z)
Morphology General Habit
Annual herb, 30–120 cm high
Morphology Stem
Stems pubescent with spreading to upward pointing hairs or occasionally with downward-pointing hairs
Morphology Leaves
Leaves ± sessile; blades narrowly elliptic to lanceolate, 3.8–12 × 0.6–1.9(–2.7) cm, margins serrate, the teeth broadly spaced, occasionally very slight, apex acute, base attenuate, upper surface with appressed hair angled away from the midrib, lower surface with appressed hairs, these more plentiful on venation, and sessile glands
Morphology Reproductive morphology Inflorescences
Inflorescence of 1–2(3) verticils spaced 30–60 mm apart, usually laxly spaced; verticils many- to moderately flowered, becoming ± globose in fruit; pedicels ± 1 mm, hairy; bracteoles linear to lanceolate, 8–17 mm long, pubescent with long or short spreading hairs
Morphology Reproductive morphology Flowers Calyx
Calyx tube funnelshaped, 5–9 mm long at anthesis (with anterior lip 7–13 mm), extending 1–5 mm in fruit mainly due to lengthening of anterior lip, outer surface pubescent with very short appressed hairs, these more spreading on lobe margins, also with occasional yellow sessile glands, inner surface with appressed hairs, these visible as a fringe at the edge of the posterior lip in the sinuses between the lobes; throat asymmetric, anterior lip 2–3 mm longer than the tube in flower, becoming up to 6 mm longer in fruit; lobes 10, anterior lip with three central and four lateral lobes, all triangular with subulate tips, up to 2 mm long, the central three somewhat longer, posterior lip with three narrowly triangular to subulate lobes, these ± half as long or as long as the anterior lip, 1.5–5 mm, the central lobe sometimes longer than the other two
Morphology Reproductive morphology Flowers Corolla
Corolla white, often drying blackish, 9–20 mm long; tube 5–10 mm long, with appressed hair in upper half, inner surface with strongly undulate band of short glandular hairs halfway down the tube; posterior lip 4–10 mm long; anterior lip as long as or slightly longer than posterior lip, 4–11 mm long, inner surface with a line of papillae at the inner side of the lateral lobes, pointing towards the sinus between the lateral and centre lobe, outer surface pubescent and with yellow sessile glands
Morphology Reproductive morphology Fruits
Nutlets 1–2.3 mm long, apex with sessile glands
Figures
Fig 11: 2, p 55
Ecology
Grassland, Brachystegia or Terminalia-Combretum woodland or thicket, on roadsides or in sandy soils; 500–2000 m
Conservation
Least concern; widely distributed
Note
Leucas tettensis is very close to L. nyassae; however, it is always an annual plant, rather than a perennial with stems arising from a woody rootstock, and this is the main difference between the two species. There is variation in corolla size, with the smallest corollas measuring 9–10 mm ( Greenway 7413, B.D. Burtt 3690) and the largest 18–20 mm (e.g. Raymond 251, Richards 22212 and 5528), but most plants have corollas 15–16 mm long. The smallest corollas tend to be found on plants that have narrowly triangular rather than subulate posterior calyx lobes that are half as long as the anterior lip of the calyx. Average and larger sized corollas tend to be found on plants with subulate posterior calyx lobes that are ± the equal in length to the anterior lip of the calyx. Herbarium specimens have a tendency to appear blackened on the leaf margins, parts of the calyx and the corolla, especially the anterior lip.
Distribution
Range: Congo-Kinshasa, Rwanda, Burundi, Zambia, Malawi, Mozambique and Zimbabwe Flora districts: T1 T2 T4 T5 T7

Native to:

Burundi, Malawi, Mozambique, Rwanda, Tanzania, Zambia, Zaïre, Zimbabwe

Leucas tettensis Vatke appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 2011 Chishala [49], Zambia K000249960
Bidgood, S. [6345], Tanzania K000468080
Bidgood, S. [5460], Tanzania K000190690

First published in Linnaea 40: 180 (1876)

Accepted by

  • Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • 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.

Literature

Flora of Tropical East Africa

  • F.T.A. 5: 485 (1900)
  • Fl. Rwanda 3: 318, fig. 101/4 (1985).
  • Linnaea 40: 180 (1876)
  • Stuttgarter Beitr. Naturk., ser. A, 341: 167 (1980)

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens

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