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Subfamily

VII. Subfam. Nepetoideae (Dumort.) Luerss. (1882).

VII. 3. Tribe Ocimeae Dumort. (1829).

VII. 3. E. Subtribe Plectranthinae Endlicher (1838).

Description

Shrubs or herbs, not aromatic; leaves simple; inflorescence thyrsoid with cymes sessile, 2-7-flowered; bracts persistent, leaf-like but smaller, sometimes with a conspicuous abaxial glandular structure; calyx cylindrical or constricted at throat distally, becoming inflated, membranous, truncate at base, 2-lipped, 3-lobed (1/2), lobes unequal, posterior rounded, smaller than anterior, not decurrent; lateral lobes absent, anterior lobes large, rounded, throat closed by converging lobes, fruiting calyx shed as a unit; corolla strongly 2-lipped, 5-lobed (4/1), white to purple, posterior lip reflexed, 4-lobed with median lobes exceeding lateral lobes, anterior lip horizontal, cucullate, corolla-tube basally geniculate and with small spur, parallel-sided distally, glabrous within but with a basal annulate ridge formed from the posterior staminal filament traces; stamens 4, held within anterior corolla lip, fused or free at base; stigma-lobes linear; disc 4-lobed with anterior lobe larger; nutlets ovoid, glabrous, slightly flattened, weakly mucilaginous. Three species in S tropical Africa, in open woodland or in rocky or damp grassland.

Distribution

Native to:

23 West-Central Tropical Africa
25 East Tropical Africa
26 South Tropical Africa

Synonyms

Plectranthastrum T.C.E.Fr., Repert. Spec. Nov. Regni Veg. 19: 298 (1924).

Publication

Alvesia Welw., Trans. Linn. Soc. 27: 55 (1869) nom. conserv.; Matthew, Kew Bull. 25: 407-411, rev.; ibid. 26: 564-565 (1972).

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Image resource

Royal Botanic Gardens, Kew