Plants annual. Stems 5-25 cm, erect, pubescent, apex with short-stalked or sessile glands. Petiole 0.8-1.5 cm, subsessile upward; stem leaf blade ovate, 1.4-1.9 × 1-1.2 cm, adaxially olive green, sparsely puberulent, abaxially pubescent, stalked or sessile glandular, base broadly cuneate, margin remotely dentate to subentire, apex obtuse to acute, or spinescent-acuminate. Cymes 3-5-flowered, 2 or 3 upper pairs sessile, in dense ovoid capitula, basal pairs widely spaced with peduncle 3-13 mm; bracts petiolate, elliptic-lanceolate to lanceolate linear, 0.8-1.2 cm, rigid, margin entire, apex spinescent-acuminate, glandular, ciliolate. Calyx 5.5-7 mm, (13-)15-veined, villous, glandular; teeth subequal, 2.5-3.5 mm, straight, apex spinescent-acuminate. Corolla 7-8.5 mm, slightly pilose; tube slender, 4.5-5.8 mm, slightly curved, abruptly dilated into throat; upper lip 1.3-1.7 mm, concave, 2-lobed; middle lobe of lower lip reniform, 0.7-1 × 1.5-1.7 mm. Nutlets yellow-brown, obovoid, ca. 1.5 × 1 mm, adaxially ± distinctly ribbed. Fl. May-Jun, fr. Jun-Jul.
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