An erect herb, annual, shining, simple or nearly so, subglabrous, 2 1/2-5 in. high; stem rather slender, furrowed, minutely glandular-pilose, leafy near the base; middle internodes exceeding the leaves; leaves opposite, lanceolate or the basal oval, obtuse at the apex, somewhat narrowed at the base, sessile or subsessile or the basal almost petiolate, denticulate-repand, membranous, minutely glandular-papillose, 1/2-1 in. long, 1/8-2/5 in. broad; racemes terminal, few-or several-flowered, rather lax, corymbose or rounded, 1-1 1/2 in. long; bracts alternate, ovate or lanceolate, obtuse, entire, 1/8-1/2 in. long; pedicels ranging up to 1/2 in. long; flowers about 7/8 in. long; calyx-segments linear-oval, pilose, 1/8-1/6 in. long; upper corolla-lip purplish, 1/2 in. long, lobes oblong, 3/8 in. long; lower lip purple, 1/3 in. long, convex, broad, bigibbous, emarginate; gibbosities yellow; palate shortly bearded; spur conical, obtuse, 1/5 in. long, yellow; young capsule excised at the apex, oval, unequally rounded at the base, 1/7 in. long, 1/14 in. broad.
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Annual, up to 300 mm tall. Leaves ovate, entire or sparsely toothed. Flowers in lax racemes, calyx lobes lanceolate to ovate, glandular pilose, corolla 17-20 mm, upper lip pink, fading to lilac with yellow rectangular spot at base, lower lip violet-red, with prominent convex palate at base, palate yellow or greenish yellow, smooth or cristate, ± half length of lower lip, with twin yellow bosses, spur 4-5 mm long, greyish white, projecting downward and curving slightly forward. Capsule oblong to oblong-ovate, 7.5-8 x 3-4 mm.
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