Description: Erect undershrub 1–1.5 m tall. Stem woody or woody at base, quadrangular, more or less hairy, usually with yellow to red glands. Leaves opposite, often pseudo-verticillate, lanceolate, 1.5–9 x 0.5–2.5 cm; apex acute; base attenuate; margin crenate or serrate, often revolute, hairy, usually with glands on both surfaces; secondary nerves 3–6; petiole up to 1 cm long. Inflorescence much branched; spikes cylindric, up to 15 cm; flowers dense. Calyx ovoid, minute; posterior lip 1-lobed, oblong, slightly recurved; anterior lip shortly 4-lobed, subequal; tube 3–5 mm long, saccate below the middle. Corolla white to purple, 8–10 mm long; posterior lip shortly 4-lobed, subequal, orbicular; anterior lip oblong, slightly concave, longer than posterior; tube gradually dilated with dorsally decurved around midpoint. Fruiting calyx bilabiate. Nutlets ovoid, dark brown, c. 1 mm long. |
Distribution: Laos and Cambodia. In Thailand commonly found in open grassy ground, marshy areas in deciduous dipterocarp and mixed deciduous forests up to 900 m in the northeast and southeast, also found in the same habitat, edge of evergreen forest in Trang (Thung Khai), in the peninsular, at c. 50 m.
Notes: Last updated on 28 October 2016. |
