Herbs annual, 2--6 cm tall, densely pubescent, ± drying black. Stems single, erect, unbranched. Leaves opposite. Petiole of basal leaves 0.7--1.5 cm, sparsely pubescent. Stem leaves ± sessile or petiole 2--3 mm; leaf blade oblong-lanceolate or ovate-oblong, 0.5--1.5 cm X 2--6 mm, pubescent on both surfaces, widely spaced crenate-dentate. Inflorescences racemose, 2--2.5 cm, few flowered; bracts leaflike, ± sessile. Pedicel 1--2 mm. Calyx 7--10 mm, slightly cleft anteriorly, densely villous; lobes 5, unequal, posterior lobe entire, others narrowly elliptic, obscurely serrate. Corolla yellow, 1.9--2 cm; tube erect, ca. as long as calyx; galea ± falcate at middle, ca. 1.1 cm, with 3--5 marginal teeth on each side near rounded apex; lower lip ca. 1/2 as long as galea, middle lobe largest. Filaments glabrous. Capsule obliquely lanceolate-ovoid. Fl. Jul--Aug, fr. Sep.
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