Epilobium willisii

Matted perennial herb, prostrate and rooting at the nodes, growing beyond flowering region; stems to 6 cm long, sparsely pubescent and with curved hairs in lines decurrent from leaf bases. Leaves crowded, mostly opposite, narrowly elliptic 0.5–1.5 cm long, 1.5–4 mm wide, glabrous, subsessile, margins with sparse, shallow teeth, apex acuminate, base tapering. Flowers with inside of hypanthium glabrous; sepals lanceolate, 2–3 mm long; petals purplish-pink, 3–4.5 mm long. Capsule 2–2.5 cm long, subglabrous to sparsely pubescent; pedicel 0.8–2 cm long; seeds 1–1.5 mm long, papillose, comose, with a pale cellular rim on adaxial side. Flowers mainly Dec.–Feb.