an ascending or diffuse herb, annual, profusely branched, pallid, 6–24 in. high; stem and branches tetragonous, shortly pilose or nearly glabrous, leafy; leaves opposite, ovate-lanceolate or lanceolate, obtuse at the apex, nearly rounded at the base, sinuate-dentate or remotely denticulate, spreading, petiolate, 1/2–1 1/4 in. long, 1/10– 2/3 in. broad; petioles ranging up to 2/5 or 1/2 in. long for the lower pairs of leaves, those of the upper pairs gradually shorter, all the leaves more or less petiolate; racemes terminal, many-or several-flowered, subcorymbose or oblong, usually dense, very blunt, often umbellate-corymbose at the top, 1–6 in. long; bracts alternate, subopposite or crowded, sessile, smaller than the leaves; pedicels slender, 1/5–1 1/5 in. long, pilose, the hairs short, slender and tipped with minute glands; calyx-segments ovate-linear or suboval, subobtuse at the apex, puberulous, 1/12– 1/6 in. long; corolla lilac-blue or purple; upper lip about 1/4– 3/8 in. long, unequally 4-lobed; lobes oblong and rounded at the apex; lower lip about 1/4– 1/3 in. long, rounded, emarginate; palate puberulous or shortly bearded; spur cylindrical, narrow, obtuse, nearly straight, 1/4– 1/3 in. long; capsules broadly oblong, scarcely or but little narrowed near the apex, unequal and slightly narrowed towards the base, 3/8– 2/5 in. long, 1/4– 1/3 in. broad; valves glabrous, subtruncate at the apex, not or scarcely horned. null
