Herbs annual or perennial, to more than 1 m tall, drying black. Stems hollow, striate, with lines of hairs; branches in whorls of 3 or 4, soft, curved. Leaves opposite or in whorls of usually 3 or 4; petiole short, villous; leaf blade oblong-lanceolate, 2--4 X 1--2 cm, adaxially glandular pubescent, pinnatipartite to pinnatisect; segments 10--14 pairs, linear, incised-double dentate, teeth callose. Inflorescences long racemose, terminal, to 20 cm, interrupted; bracts leaflike. Pedicel short. Calyx 8--9 mm, villous; lobes 5, unequal, serrate. Corolla purple-red, 1.8--2.2 cm; tube ca. 7 mm, slightly curved in calyx; galea strongly bent at apex; beak straight, 2.5--3.5 mm; lower lip longer than galea, to 1.1--1.2 X ca. 1 cm, middle lobe lanceolate, apex acute. Filaments glabrous. Fl. Aug--Sep, fr. Sep--Oct.
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