A small herb, 10-21 cm high, rarely branched at the base. Stems somewhat angular, glabrous below, with a few scattered capitate glands above, bearing 1-3 pairs of opposite leaves. Radicle leaves 1-2-35 cm long, 3-5 mm, broad, elliptic, lanceolate or linear, obtuse, entire or remotely toothed; cauline leaves 0.6-3.5 cm long, 1-2 mm broad, linear, obtuse, entire or remotely toothed, glabrous. Flowers in terminal racemes; racemes 2-8-flowered; axis bearing capitate glands. Bracts 5-6 mm long, linear, obtuse, bearing capitate glands. Pedicels 0.6-2 cm long, glandular. Calyx-segments 4 mm long, oblong or elliptic-oblong, obtuse, densely glandular. Corolla when flattened out 2 cm wide; anterior lip truncate, produced into two pouches at the base, villous inside; lobes of the posterior lip 8 mm long, 5.5 mm broad, oblong, obtuse. Stamens 4; filaments 2 mm long, spirally coiled near the base, glabrous. Ovary 1.5 mm long, ovate in outline, glabrous; style 0.5 mm, long; stigma truncate. Fruit 6 mm long, 75 mm broad, ovate in outline, almost truncate above, with the persistent style situated in a depression, scantily glandular. The corolla is a claret colour outside, blue inside with a dark blotch on the anterior lip.
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