An erect or ascending herb, annual, glabrous below, pilose above, sinning, simple or more or less branched from the base, 1/2-1 1/2 ft. high; stem and branches quadrangular, smooth or nearly so, stiff, rather slender; upper internodes exceeding the leaves; leaves opposite, ovate or lanceolate, or the uppermost sublinear, obtuse or rounded at the apex, rounded or very obtuse at the sessile or subsessile base or the lower petiolate, denticulate or subentire, 1/2-2 in. long, 1/12-1/2 in. broad; petioles of the lower leaves ranging up to 1/2 in. long; racemes terminal, oblong or subcorymbose, several-or many-flowered, 2-8 in. long; bracts alternate, smaller than the leaves; pedicels inserted in the axils of the bracts, ranging up to about 1 in. long; calyx-segments lanceolate-linear or linear, puberulous, ciliolate, obtuse, 1/8-1/6 in. long; corolla varying in colour, yellow, red and white; uppermost lobes oblong, obtuse, 1/3-1/2 in. long, 1/8-1/6 in. broad, longer than the broad and emarginate lower lip; palate thinly bearded; spur straight, conical, 1/6 in. long; capsule ovoid-oblong, oblique and unequally narrowed at the base, 1/4-3/8 in. long, 1/5-1/4 in. broad; valves somewhat contracted at the top, inner curved parts of the upper edges meeting at an obtuse angle, the outer parts shortly apiculate, points diverging.
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Annual, up to 600 mm tall. Leaves elliptic-lanceolate, slightly toothed. Flowers in lax racemes, calyx lobes lanceolate, glandular pubescent, corolla 15-26 mm long, upper lip with narrowly oblong lobes, white or pale orange with yellow rectangular spot at base, lower lip yellow or pale orange, with strongly convex bilobed palate at base, palate glabrous, yellow or orange, smooth or cristate, often with red or brown veining, tube pubescent within, spur 3.5-5.4 mm long, projecting downwards. Capsule narrowly oblong, longer than wide.
Annual to 40 cm. Leaves opposite, elliptic-lanceolate, slightly toothed. Flowers in racemes, white or pink, sometimes orange, with yellow, lower lip and raised palate, velvety within, upper lobes narrowly oblong, spur ± 3 mm long. Capsules longer than wide, oblique at base.
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