An erect or ascending herb, often diffuse, annual, glabrous below, slightly pilose above, shining, simple or branched from the base, 4-18 in. high; stem and branches quadrangular, smooth or nearly so, slender; upper internodes exceeding the leaves, the lower or basal short; leaves mostly opposite, ovate or lanceolate or sub-linear, obtuse at the apex, rounded at the sessile base or the lower somewhat narrowed and shortly petiolate, denticulate or entire, 1/5-1 in. long, 1/20-1/3 in. broad; racemes subcorymbose or oblong, elongating, rather lax, several-or many-flowered, 1-12 in. long; bracts alternate, smaller or narrower than the leaves; pedicels inserted in the axils of the bracts, slender, 1/5-3/5 in. long, finely pilose; flowers orange-red and yellow (Galpin); calyx-segments lanceolate-linear or sublinear, puberulous, obtuse or subacute, 1/12-1/10 in. long; upper corolla-lobes oblong, rounded at the apex, 1/12-1/8 in. long; lower lip 1/5 in. long, rounded; palate bearded; spur narrowly conical-cylindrical, straight, blunt, purplish, about 1/10 in. long, not dilated at the free end; capsules 1/6-1/4 in. long, 1/6-1/5 in. broad, broad and emarginate at the top, rather unequally rounded at the base.
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