Leucas glabrata (Vahl) Sm.

First published in A.Rees, Cycl. 20: n.° 10 (1812)
This species is accepted
The native range of this species is Eritrea to S. Africa, Arabian Peninsula. It is a perennial or subshrub 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]

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Morphology General Habit
Annual or perennial herb, 0.3 –2 m tall
Morphology Stem
Stems sharply 4-angled, subglabrous to rather densely pubescent with recurved hairs
Morphology Leaves
Leaves petiolate; blade ovate to lanceolate, up to 12–60 × 7–35 mm, 1.1–5 times as long as wide, almost glabrous to densely hairy, without sessile glands but often with minute glandular hairs below, apex obtuse to acute or slightly acuminate, margin crenate-serrate or rarely entire
Morphology Reproductive morphology Inflorescences
Verticillasters spaced; cymes 3–11-flowered, with up to 5 mm long peduncles; bracteoles subulate, 1–3(–6) mm long; pedicels 0.5–4 mm long
Morphology Reproductive morphology Fruits Fruiting calyx
Fruiting calyx 10-lobed, zygomorphic, rather wide at the mouth, 5.5–11 mm long at the dorsal side, 6.5–13 mm long at the ventral side; lobes ± unequal, 1–5 mm long
Morphology Reproductive morphology Flowers Corolla
Corolla 10–20 mm long; lower lip ± as long as the upper lip
Morphology Reproductive morphology Flowers Gynoecium Style
Style-branches ± unequal
Morphology Reproductive morphology Fruits
Nutlets sharply trigonous, 2–3 × 1–1.5 mm, apex truncate and usually with minute shortly stalked glands.
[FSOM]

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
Types: Yemen, Forsskål 217 (C-Forssk., syn.) & 222 (C, syn.)
Morphology General Habit
Perennial subshrub from a woody rootstock, with ascending stems forming an erect loosely branched bush, or herb (occasionally annual) with multiple stems, either form occasionally straggling over other vegetation, 0.3–1.8 m high
Morphology Stem
Stems sharply quadrangular, occasionally with dark coloration at the angles, subglabrous to pubescent with downward-pointing (occasionally upward pointing) hairs, also occasionally with yellow sessile glands or glandular hairs
Morphology Leaves
Leaves shortly to distinctly petiolate; blades narrowly ovate to ovate or occasionally ± lanceolate, 0.7–9 × 0.3–0.5 cm, margin serrate to crenate-serrate, apex acute or rounded, base rounded, upper surface sparsely to evenly pubescent with usually appressed hairs, the hairs occasionally with enlarged bases appearing hispid, sometimes the venation appearing impressed, lower surface as upper although hairs can be more plentiful on the venation which is often raised, also with varying amounts of yellow sessile glands; petioles 4–25 mm long, with short eglandular or occasionally glandular hairs
Morphology Reproductive morphology Inflorescences
Inflorescence of (2–)6–8 verticils spaced 7–55 mm apart; 6–8(–12) flowers per verticil; pedicels 1–2(–20) mm long, with short eglandular downwardpointing or glandular hairs; bracteoles subulate, 1.5–3(–6) mm long, with short downward-pointing eglandular or occasionally glandular hairs
Morphology Reproductive morphology Flowers Calyx
Calyx funnelshaped, tube 7.5–11 mm long at anthesis, not noticeably expanding in fruit, pubescent with appressed hairs especially on the vein ridges, also with yellow sessile glands, inner surface with short hairs; throat asymmetric, the anterior lip 1–3 mm longer than the posterior; lobes 10, narrowly triangular to triangular, often becoming subulate, the anterior three lobes on a ± 1 mm extension of the tube then 1.5–2 mm long, the other lateral and posterior lobes 2–3 mm long
Morphology Reproductive morphology Flowers Corolla
Corolla with white hairs, 9–?18 mm long; tube 6.5–9 mm long, outer surface pubescent becoming glabrous in the lower half, inner surface with a slightly undulate band of glandular hairs halfway down the tube; posterior lip 5–7.5 mm long; anterior lip 4–7.5 mm long, inner surface with short hairs at the inner side of the lateral lobes, pointing towards the sinus between the lateral and centre lobe, outer surface pubescent except towards the lobe margins
Morphology Reproductive morphology Fruits
Nutlets 1–2(–2.7) × (0.3–)1–1.3 mm, conspicuously warty, eglandular
Figures
Fig 12: 5-9, p 66
Ecology
Found in a variety of different habitats, from damp ground in riverine alluvial plains to dry lava outcrops, on inselbergs and termite mounds, in grassland, mixed dry bushland to mixed deciduous woodland, both in shade or in direct sunlight, and in stony soil, amongst granites, black cotton soil, red lateritic soil or in dark loam; 20–2100(–2700) m
Conservation
Least concern; widely distributed
Note
In K 1 there is one specimen, Gilbert & Thulin 1130 from Wajir, with considerably longer pedicels than all others (to 20 mm long as opposed to 1–2 mm long). Occasionally bracteoles can be longer than typical (up to 6 mm), especially in T 3, e.g. Hedberg 6913 from Same and Faulkner 980 from Magunga Estate, Korogwe. Leucas glabrata is a widespread taxon, varying especially in its habit and leaf morphology. All forms are united, however, by the sharply angled square stem and by all features of the inflorescence, with the exception of variation in size. Leaves vary greatly in shape and size and this seems to be partly correlated to habitat: in shady areas such as woodland, the plants tend to have larger leaves, are taller and less branched, but in more open areas such as grassland and disturbed areas the plants have much smaller leaves, woodier stems (perhaps as a result of grazing pressure) and are more branched. Leaves can be very tiny, e.g. 7 × 3.5 mm on Greenway, Turner & Harvey 10543. In T 3 there are plants with largish ± lanceolate leaves, e.g. Faulkner 980, 4034 and Archbold 127. Sebald’s var. chiatelliniana, known only from the Somalian type and one collection from K 7, and L. schliebenii Sebald, known only from the type, are reduced to synonymy on the basis that they share all characters with the variable L. glabrata.
Distribution
Flora districts: U1 U3 K1 K2 K3 K4 K5 K6 K7 T1 T2 T3 T5 T6 T7 T8 Range: Rwanda, Sudan, Eritrea, Ethiopia, Somalia, Zambia, Malawi, Mozambique, Zimbabwe, Botswana, Namibia and South Africa, also in Yemen and Saudi Arabia
[FTEA]

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Type
S3, “Chisimaio”, Senni 530 (FT holo.)
Distribution
S3 - The type is the only typical collection from Somalia. Kenya
Ecology
Low altitude.
[FSOM]

Sources

  • Angiosperm Extinction Risk Predictions v1

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

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

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

    • 'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    • 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 2024. 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 2024. 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