An erect or suberect herb, annual, about 6-10 in. high, glabrous below, somewhat glandular-pilose above, leafy at least below, usually branched from the base; stem and branches quadrangular; leaves opposite, linear, very obtuse at the apex, slightly narrowed towards the sessile narrowly decurrent base, entire (or rarely with a few small teeth), somewhat fleshy, glabrous, 1/2-1 1/4 in. long; racemes oblong, terminating the stem and branches, flat at the top, 3-6 in. long, puberulous; bracts alternate, linear or lanceolate, obtuse, entire, sessile, gradually shorter than the leaves; pedicels alternate, in the axils of the bracts, 1/2-1 in. long, slender, more or less spreading; calyx-segments oval or oblong, obtuse, glandular-puberulous and-ciliolate or nearly glabrous, 1/12-1/10 in. long; corolla 1/4-2/5 in. long and broad, blue, glabrous, not bearded, with a short broad pouch at the base; upper lip deeply 4-lobed; lobes oblong or ovate, rounded at the apex, about 1/8 in. long; lower lip bifid at the apex, 1/6 in. long, the full breadth of the corolla; anthers scarcely cohering; capsule about 1/4 in. long, 1/5 in. broad, obovoid, subtruncate and emarginate at the apex; valves broad, curved and making an obtuse angle with each other at the apex.
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Annual, up to 300 mm tall. Leaves linear, entire. Flowers in lax racemes, calyx lobes oblong to obovate, glandular puberulent, corolla ± 10 mm long, white to lilac, upper lobes linear oblong, obtuse, with red lines at base, lower lip broadly ovate, wider than long, white with maroon base, palate scarcely raised with two white spots edged in blue, tube maroon, sac short, conical, ± 1.4 mm long, maroon. Capsule triangular, as wide as long.
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