Herb, erect, often branched, somewhat succulent; stems striate. Leaves op-posite, uppermost crowded to appear whorled, the blade elliptic to oblong-elliptic, glabrous, 2-7.5 cm long, 1-3 cm broad, serrate toward the apex, entire toward the base, obtuse to subacute at apex, mucronate, short-cuneate at base; lateral veins 8-12 pairs, ascending, inconspicuous; petioles 1-4 cm long, glabrous. Inflorescences racemose, borne singly in the upper axils, usually 2-flowered; peduncles 4-5 cm long, glabrous. Flowers scarlet, with the pedicels 16-19 mm long, with a single bract about midway, the bract 3-4 mm long, deltoid, clasping, apiculate, glabrous; lateral sepals to 8 mm long, 7 mm broad, circular, ovate, apiculate, subcordate at the base; posterior sepal to 2-3 cm long (including the spur), saccate, horn-like, inflated at the apex, gradually spurred, the spur incurved, unspotted; anterior petal to 10 mm long and broad, broadly ovate to broadly oblong, usually apiculate; lateral petals united, oblong-elliptic with 2 oblong or ovate lobes to 4 mm long, 3-4 mm broad; ovary usually glabrous. Capsules to 2.5 cm long, clavate, 2-3 mm in diam, glabrous; seeds not seen.
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