An erect or ascending herb, annual, nearly glabrous below, slightly pilose above, simple or branched from the base, shining, 4-14 in. high; stem and branches tetragonous, smooth or nearly so; upper internodes mostly exceeding the leaves; leaves opposite, ovate, oblong-lanceolate or sublinear, obtuse or rounded at the apex, more or less narrowed to the sessile or subsessile base, or in the case of the lower leaves almost petiolate, entire, toothed or denticulate, 1/3-1 3/4 in. long and 1/30-3/5 in. broad or rather larger; racemes terminating the stem and branches, subcorymbose and elongating, several-or many-flowered, 1-3 in. long; bracts alternate, 1/12-1/6 in. long; pedicels inserted in the axils of the bracts, the lower ranging up to nearly 1 in. long, the upper shorter; calyx-segments broadly linear, obtuse, puberulous, 1/12-1/8 in. long or in fruit about 1/5 in. long; corolla variable in colour, either white and striate outside or cinnabar-red, striate outside and sulphur-coloured on the throat or sulphur-coloured and not striate; the four upper corolla-lobes oblong, 1/6-1/5 in. long, obtuse; lower lip about as long as the upper, 1/4 in. long; palate somewhat bearded or pubescent, bicallose; spur incurved or nearly straight, not thickened at the free end, 1/5-1/3 in. long; capsules 1/4-2/5 in. long, 1/4-1/3 in. broad, unequally rounded at the base, broadly notched at the apex; valves curved at the apex, obtusely pointed at the outer side.
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