An erect or ascending herb, annual, finely pilose or below glabrous, 4-15 in. high, simple or loosely branched, shining; lower internodes short, upper longer than the leaves; stem and branches tetragonous, furrowed, rather slender; leaves mostly opposite, oval, ovate or lanceolate or the upper sublinear, obtuse at the apex, subtruncate or shortly narrowed at the base, sessile or subsessile or the basal shortly petiolate, denticulate or subentire, 1/2-1 in. long, 1/8-1/2 in. broad; racemes terminal, subcorymbose or elongated and oblong, few-or many-flowered, 1/2-1/8 in. long; bracts alternate, sublinear, smaller than the leaves, sessile, glandular-puberulous, spreading or deflexed; pedicels rather slender, spreading or ascending, finely pilose, 1/8-5/8 in. long; calyx-segments narrowly oval-linear, obtuse, 1/8-1/6 in. long; upper corolla-lobes lanceolate-linear, obtuse, about 2/3-3/4 in. long, pallid, longer than the lower lip; palate subglabrous, with two orange-coloured gibbosities; spur conical, obtuse, 1/8-1/5 in. long, pallid; capsules broadly ovate-oblong, subtruncate or broadly notched and sub-emarginate at the apex, unequal and scarcely or quite rounded at the base, glabrous, 1/4-1/3 in. long, 1/6-1/4 in. broad, slightly narrowed a little below the apex, not horned.
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Annual, up to 300 mm tall. Leaves mostly lanceolate to linear, glabrous or with occasional glandular trichomes. Flowers in lax racemes, calyx lobes ovate, glandular-puberulent, corolla 17-21 mm long, upper lip white to pale yellow, lower lip yellow with basal palate bearing 2 orange bosses, spur conical, 3.9-5.9 mm long, deflexed, ± straight. Capsule ovate to oblong, 3.9-6.8 x 3.6-5.3 mm.
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