Lamiaceae
Leucas

Leucas stormsii Gürke

First published in Bot. Jahrb. Syst. 22: 140 (1895)
This species is accepted
The native range of this species is W. Tanzania to Angola. It is an annual and grows primarily in the seasonally dry tropical biome.

Descriptions

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: not threatened. Confidence: confident
[AERP]

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. Leucas, G. Bramley. Flora of Tropical East Africa. 2009

Type
Type: Tanzania, Mpanda District: Lake Tanganyika, Karema, Storms 4 (B†, holo., photo!, K!, fragment, Z, scanned image!)
Morphology General Habit
Annual herb, 20–60 cm high
Morphology Stem
Stems pubescent with appressed downward-pointing hairs
Morphology Leaves
Leaves ± sessile; blades narrowly elliptic, 1.5–8 × 0.4–2.5 cm, margins serrate (the teeth ± 90 degrees), apex acute, base attenuate, upper surface with appressed hair and yellow sessile glands, lower surface with appressed hairs, more plentiful on venation, also with yellow sessile glands
Morphology Reproductive morphology Inflorescences
Inflorescence of 1–3 verticils spaced 20–45 mm apart; verticils many-flowered, becoming ± globose in fruit; pedicels ± 1 mm long, hairy; bracteoles narrowly ovate to very narrowly ovate (almost linear) with a spinescent to subulate apex, midrib distinct, 9–11 × 2–3 mm, pubescent with spreading hairs on midrib and margins, shorter hairs scattered on remaining surface
Morphology Reproductive morphology Flowers Calyx
Calyx tube funnel-shaped, very slightly oblique at mouth, 7–14 mm long at anthesis, extending 1–2 mm in fruit, pubescent with long spreading hairs on vein ridges, especially on the lobes, with shorter hairs on lobe margins; inner surface with appressed hairs; throat slightly asymmetric; lobes 10, ± equal, 2–3 mm long, narrowly triangular with subulate apex, central lobe on posterior side somewhat longer
Morphology Reproductive morphology Flowers Corolla
Corolla white, 8–16 mm long; tube 5–11 mm long, with appressed hairs in upper half, inner surface with a strongly undulate band of short glandular hairs halfway down the tube; posterior lip 3–5 mm long; anterior lip as long as or slightly longer than posterior, 5–6 mm long, inner surface with a line of hairs at the inner side of both lateral lobes, pointing towards the sinus between the lateral and centre lobe, outer surface pubescent including lobe margins, also with yellow sessile glands
Morphology Reproductive morphology Fruits
Nutlets oblong-obovoid, ± 2.5 mm long, flattened top with sessile glands.
[FTEA]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • 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 Vascular Plants 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0