Description

Key Characters:

Growth Form: Erect, pubescent annual herbs.

Stems: Stems erect, 1–5(–7) dm long, usually unbranched, glandular pubescent.

Roots:

Leaves: Leaves simple. Opposite. Blades oblong to lanceolate, 1–4.5 cm long, 0.3–1.5 cm wide, scabrous. Base sessile. Margins coarsely serrate. Petioles absent. Stipules absent.

Flowers: Flowers in terminal, leafy spikes. Flowers bisexual (perfect). Calyx campanulate, 4-lobed, the lobes lanceolate; 10–16 mm long, the teeth linear–lanceolate, about as long as tube. Corolla yellow, rarely white, bilabiate, upper lip hooded, lower lip with a 2–ridged palate, the lobes longer than the hood, 16–24 mm long, caducous. Stamens 4, in 2 pairs; anthers pubescent. Ovary superior; stigma capitate.

Fruit: Capsules oblong; 7–9 mm long; pubescent with brownish hairs. Seeds ca. 0.3–0.4 mm long.

Ploidy: 2n = 40; 48

Habitat: Pastures.

Elevation Range: 1,450–1,520 m.