An ascending or suberect herb, annual (Bolus), glabrous or nearly so except the inflorescence, 3-9 in. high, woody and much branched at the base; branches ascending, decussate, angular, leafy at least below, firm or wiry; internodes mostly about equalling or shorter than the leaves; leaves opposite, lanceolate, sublinear or ovate, acute or apiculate, somewhat narrowed to the sessile subdecurrent base or the lower wedge-shaped to the shortly petiolate base, strongly toothed, thick, 1/3-1 in. long, 1/12-1/3 in. broad; teeth acute or apiculate; racemes terminal, short, few-flowered, lax; pedicels 1/3-2/3 in. long, finely pilose or puberulous, arising from the axils of bracts; bracts alternate or the lowest opposite, sublinear and smaller than the leaves or the lowest leaf-like; calyx-segments lanceolate or somewhat ovate or oblong, obtuse or scarcely acute, glandular-pilose or-puberulous, 1/10-1/5 in. long; corolla blackish-purple (Bolus), 2/5-3/4 in. long, sparingly pilose outside, glabrous within; tube inflated, gaping at the throat, with two shallow pockets on the upper side; limb patent; upper lip deeply 4-cleft, about 1/4 in. long, the full breadth of the corolla; lobes rounded, subequal, 1/5 in. in diam.; lower lip broadly oblong, rounded at the apex, 1/3 in. broad at the base, about 1/4 in. long, entire; pouch broadly saccate-conical, very blunt, 1/4-1/3 in. long, 1/3-3/8 in. broad, inflated, notched at the tip; capsule ovate-oblong, excise at the apex, somewhat unequal and nearly rounded at the base, glabrous, 1/5 in. long, 1/7 in. broad.
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Short-lived perennial to 20 cm. Leaves opposite, elliptic-lanceolate, margins revolute, toothed. Flowers few in racemes, strongly saccate, purple to blackish, lobes rounded, velvety in throat. Capsules longer than wide.