An erect herb, slender, annual, simple or sparingly branched above, thinly pubescent or subglabrous, 4 1/2-18 in. high; stem tetragonous, furrowed, striate; internodes mostly exceeding the leaves; leaves opposite or the upper alternate, rather few, ovate-oblong, spathulate or sublinear, denticulate, sessile or the lowest almost petiolate, obtuse at the apex, narrowed or scarcely so at the base, 3/8-1 in. long, 1/30-1/5 in. broad; racemes terminal, several-or many-flowered, dense at the apex, lax below, 1-8 in. long or those of the lower branches shorter; bracts alternate, lanceolate or sublinear, small; pedicels very slender, ranging up to 2/3 in. long; calyx-segments ovate-oblong, obtuse, 1/20-1/12 in. long; corolla about 1/4 in. long; lips about 1/8-1/6 in. long, streaked; lobes of the upper lip oval-oblong, 1/16-1/12 in. long; lower lip rounded; palate bearded; spur linear-oblong, blunt, 1/12-1/6 in. long; capsules broadly obovate, obcordate, broadly notched and 2-horned at the apex, narrowed at the base, 1/12-1/6 in. long, 1/8-1/4 in broad at the apex.
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Slender annual to 25 cm. Leaves opposite, ovate-elliptic, slightly toothed. Flowers in racemes, tiny, yellow to orange with a purple spur, lower lip with 2, raised, velvety bosses, upper lobes minute, oblong, spur ± 2 mm long. Capsules small, triangular.
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