Perennial dioecious herb. Root thick woody. Rhizome thick, branched, 1.5-6 mm wide. Scaly radical leaves on the apical part of the rhizome. Flowering stems numerous, simple, erect, glabrous, 8-24 cm high, 1-3 mm wide at anthesis, old flowering stems persistent. Cauline leaves alternate, sessile, obtuse, coarsely dentate, elliptic to elliptic-oblong, 5-10 x 2-3 mm. Inflorescence terminal, dense, corymbiform, capitate. Flowers unisexual, 4-merous, pedicel 1-2 mm long. Calyx 1.5-2 x 0.4-0.6 mm, lobes basally connate, red, oblong-elliptic, obtuse. Petals yellow, glabrous, oblong-elliptic, obtuse, 3-4 x 0.8-1.2 mm. Stamens 8, longer than petals, in two whorls, basifixed, epipetalous 3.5-4 mm long, alternipetalous 4-4.5 mm long. Pistillodes 2.5-3 x 0.4-0.6 mm. Style indistinct; Carpels 3-4.5 x 0.8-1.9 mm, style 0.8-1 mm long in female flower. Nectar scales oblong, 0.8-1 x 0.2-0.3 mm. Follicles 6-7 x 1.5-2 mm. Seeds 1-2 x 0.2-0.4 mm, ellipsoid, apex pointed.