Description
Key Characters:
Growth Form:
Herbs to 50 cm tall, annual, much branched.
Stems:
Stems 4-angled, glabrous.
Roots:
Leaves:
Leaves simple.
Opposite.
Blades ovate-lanceolate, lanceolate, or narrowly elliptic, 1.5-7 × 1-2.5 cm.
Apex acute to shortly acuminate.
Base attenuate and decurrent onto petiole.
Surfaces glabrous, abaxially pale green, adaxially green.
Margins entire.
Secondary veins 3-5 on each side of midvein.
Petioles 0.3-1 cm.
Stipules absent.
Flowers:
Inflorescences terminal, leafy panicles of secund racemes; rachis glabrous to sparsely pubescent; bracts triangular to subulate, 1-1.5 mm; bracteoles linear to subulate, 1-1.5 mm.
Flowers perfect, pedicel 2-9 mm, sparsely pubescent with gland-tipped and non-glandular trichomes (gland-tipped pubescent).
Calyx deeply 5-lobed, 2.5-3 mm, outside glabrous or gland-tipped pubescent, lobes subulate.
Corolla white, 0.9-1.5 cm, outside gland-tipped pubescent; tube basally funnelform for 4-8 mm; lower lip with purple dots, 3-lobed, 5-7 mm, erect, lobes ca. 3 mm; upper lip 5-7 mm, reflexed, 2-lobed, lobes ca. 1 mm.
Stamens exserted from corolla tube.
Ovary superior; style 6-10 mm, sparsely pilose toward base.
Fruit:
Capsules ellipsoid-compressed; 1.5-2 × 0.3-0.4 cm; glabrous or sparsely pubescent with gland-tipped trichomes; ca. 12-seeded.
Seeds ca. 2 × 1.5 mm; rugose.
Ploidy:
2n = 50.
Habitat:
Elevation Range: