Description

Key Characters:

Growth Form: Erect, ascending, or prostrate perennial herbs.

Stems:

Roots:

Leaves: Leaves simple. Opposite. Margins entire to dentate or pinnatifid. Petiolate. Stipules absent.

Flowers: Flowers 2–6 in dense verticillasters, these arranged in dense, bracteate, terminal, spike-like inflorescences. Calyx bilabiate, narrowly funnelform, irregularly 10–nerved, upper lip broad, shallowly 3-toothed, lower lip deeply cleft into 2 narrow teeth, splitting longitudinally, usually persistent or sometimes only ventral 1/2 persistent. Corolla zygomorphic, bilabiate, contracted at throat, tube often exserted beyond calyx, pilose, with a ring of hairs within, upper lip galeate, entire or subentire, lower lip shorter, 3-lobed, lateral lobes deflexed, median one concave, margins crenulate; nectary disk often present at base of ovary, annular or developed on anterior side only. Stamens 4, in 2 pairs, ascending under the galea, lower pair longer, scarcely exserted beyond corolla tube, aligned with the sinuses; anther sacs divaricate; anthers dithecal, on an expanded connective, opening by longitudinal slits. Ovary superior, 2-carpellate; ovules 1 per ovary lobe, placentation basal-axile; style 1; stigmas 2.

Fruit: Nutlets 4; 1-seeded; ovoid to cylindrical; smooth. Seeds with endosperm absent or scanty and oily.

Ploidy:

Habitat:

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