Herbs, perennial. Stems: basal produced; flowering erect, 25–80 cm, sparsely sericeous, glabrescent. Leaves of flowering stems opposite or subopposite; blade linear to narrowly elliptic, 15–30 × 1.5–3 mm, apex acute, indurate, abaxial surface hairy on midvein and, sometimes, margins, adaxial glabrous. Pedicels 1 per axil, 1–2.3 mm. Flowers: calyx 1.4–2 mm, outer sepals shorter than inner. Capsules subglobose, 1.5–2.2 × 1.3–1.6 mm, longer than calyx. Seeds 2–3(–4).