Herbs, perennial, caespitose, with stout rootstock and slender, woody rhizomes. Stems erect or ascending, 8-30 cm tall, 4-angled and ± puberulent. Leaves in whorls of 4 in lower and of 6 in middle stem region, sessile; blade dark green adaxially, pale green abaxially, linear or linear-oblong, 7-15 × 0.5-2.5 mm, smooth or usually sparsely to densely scaberulous adaxially, usually densely hairy abaxially, base acute to cuneate, margins ± revolute, apex mucronate; vein 1. Inflorescences narrowly paniculate with axillary and terminal, 3-15-flowered cymes; peduncles bracteose, ± densely pubescent (rarely glabrescent), with 1-3 mm long pedicels. Ovary ellipsoid, ± puberulent. Corolla yellow, rotate, 3-4 mm in diam., lobed for 3/4 or more; lobes 4, ovate-oblong, acute. Mericarps ellipsoid, ca. 2 × 3 mm, ± densely puberulent (rarely glabrous or ± tuberculate). Fl. and fr. Jul-Aug.
Home