| Description |
Perennial herbs. Rhizomes woody, creeping, branched. Stems erect, 70--100 cm tall, 4-angled, recurved puberulent. Leaves opposite, membranaceous; petiole 0.5--3 cm long, sparsely pubescent; blade ovate, oblong-ovate or widely lanceolate, 7--12 cm long, 2.5--4 cm wide, apex acuminate, base acute or cuneate, decurrent into petiole, acute-serrate, upper surface sparsely pubescent, lower surface glabrous except pubescent nerves. Flowers August to October. Inflorescences terminal and in upper leaf axils, raceme-like paniculate, 10--20 cm long; rachis subdensely puberulent. Bracts lower ones leaf-like, small, gradually smaller upward. Bracteoles setaceous 1--2 mm long. Peduncle 3--10 mm long, pedicel 2--5 mm long, minutely puberulent. Calyx campanulate, bilabiate, ca. 3 mm long in flower, 6 mm long in fruit, minutely puberulent; upper lip 3-lobed, lobes deltoid-ovate, acuminate; lower lip slightly longer than upper lip, 2-lobed, lobes narrowly triangular-ovate, attenuate-acuminate. Corolla bilabiate, blue, 17--20 mm long, short pilose outside, 12--14 mm long, slightly gibbous on upper side at base; upper lip 2--3 mm long, shallowly 4-lobed; lower lip 3--4 mm long, slightly longer than upper lip. Stamens 4, didynamous, included. Nutlets globose, ca. 1.5 mm long, smooth, glabrous. |