Herbs perennial, woolly, densely so above. Stems erect or ascending, quadrangular, 40--60 cm tall, basally branched, densely woolly. Leaves oblong-lanceolate to ovate-lanceolate, 3--12 × 1.5--2.5 cm, both surfaces lanate, midvein raised abaxially, base narrowed into short petiole, apex acuminate. Flowers in large terminal, dichotomous cymes; bracts lanceolate, herbaceous, densely lanate. Pedicel 1--3 cm, densely woolly, pendulous after anthesis. Sepals oblong-ovate or narrowly ovate, 6--8 × 2--2.5 mm, outside densely lanate. Petals 5, broadly obovate-cuneate, 8--10 mm, 5--7-cleft to middle or below; lobes nearly linear. Stamens 10, shorter than petals. Ovary broadly ellipsoid-ovoid; styles 3, linear. Capsule ovoid, slightly longer than persistent sepals, 6-valved. Seeds 2--5, black-brown, reniform, slightly compressed, scrobiculate. Fl. Jun--Aug, fr. Jul--Sep.
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A herb. It keeps growing from year to year. It is woolly. The stems are erect and 4 sided. It grows 40-60 cm tall. The leaves are a long sword shape. They are 3-12 cm long by 2-3 cm wide.