Herbs. Stems ascending to erect, <usually red-tinged>, 15–50(–65) cm, stellate-pubescent to glabrate. Leaves cauline; petiole 1–3 mm; blade oblanceolate-elliptic to narrowly elliptic, <tapered to base>, 12–30(–38) × 4–7(–10) mm, <apex acute>, surfaces stellate-tomentose and with scattered simple hairs abaxially, <± lustrous>, sparsely stellate-pubescent and with simple hairs adaxially, lateral veins raised abaxially. Inflorescences terminal or subterminal, cymes; chasmogamous flowers 1–3 per cyme, cleistogamous 1–3 per glomerule, <on lateral leafy branches 6–18 cm, flowering 1–3 months later than chasmogamous>. Pedicels (1.5–)4–10(–17) mm, <with stellate and simple hairs>; bracts absent. Chasmogamous flowers: outer sepals narrowly lanceolate, 2–6 × 0.5–1 mm, inner sepals 5–9 × 3.5–5 mm, apex acute; petals obovate, 8–15 × 6–14 mm; capsules 5–8 × 4–7 mm, glabrous. Cleistogamous flowers: outer sepals rudimentary, 0.2–0.5 × 0.2–0.4 mm, inner sepals obovate, 2.5–4 × 2.5–3.5 mm, apex acute; capsules 2.3–3.5 × 2.5–3.5 mm, glabrous. 2n = 20.
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