Herbs annual, 30--50(--70) cm tall, slightly woody basally, not drying black. Roots conical, slender. Stems single, branched or not, with 4 lines of hairs. Basal leaves withering early. Stem leaves opposite or in whorls of 3 or 4; petiole to 2 cm; leaf blade oblong-lanceolate, 1.3--8 X 0.5--3 cm, abaxially pubescent along veins, adaxially sparsely pubescent or glabrescent, pinnatipartite to pinnatisect; segments 5--11 pairs, widely spaced, oblong-lanceolate, often not symmetrical, margin double dentate or pinnatifid. Inflorescences spicate, interrupted; proximal bracts leaflike, distal ones ovate. Pedicel short. Calyx scarcely cleft anteriorly, membranous; lobes 5, unequal, posterior one triangular, entire, lateral teeth larger, lanceolate-linear, obscurely serrate, ciliate. Corolla yellow, 1.3--1.5 cm; tube slightly bent apically, 6--8 mm; galea ± twisted; beak dark colored, semicircular, slender; lower lip ca. 7.5 mm X 1.1 cm, densely ciliate, middle lobe hoodlike. 2 filaments pubescent and 2 glabrous, or sometimes all 4 pubescent. Capsule compressed, ovoid, ca. 1.5 cm X 8 mm, obliquely apiculate. Fl. Aug--Sep, fr. Sep--Oct.
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