Subshrubs, perennial, originating from a woody rootstock. Stems often ± woody at base, up to 40 cm tall, erect, weakly 4-angled, glabrous to puberulent. Leaves opposite, subsessile; blade drying stiffly papery, linear to linear-lanceolate, 3-6(-15) × 0.5-1.5(-3) mm, glabrous throughout or ± hairy, base and apex acute; secondary veins not evident; stipules 2-4 per leaf pair, reduced and never more than 0.3 mm. Inflorescences terminal and axillary, dichasial, branched to 1-4 orders, glabrous to puberulent; peduncles 1-10(-30) mm; bracts linear to narrowly elliptic (i.e., leaflike), 1-4 mm; pedicels 0-3 mm. Corolla pink to purple, funnelform, glabrous to sparsely pilose outside; tube ca. 2 mm; lobes 4, ovate-oblong, ca. 1.5 mm. Ovary subglobose to narrowly ellipsoid, 0.5-1 mm, glabrous to densely pilosulous. Mericarps ovoid, 1.5-2.5 mm, glabrous to densely pilosulous. Fl. Jun-Jul, fr. Jul-Aug.
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