Pilea penninervis C. J. Chen

Herbs perennial, stoloniferous but nodes not thickened, glabrous, dioecious. Stems much branched, 15-25 cm tall, somewhat succulent; internodes 1.5-3.5 cm. Leaves on upper stem and branches; stipules almost persistent, deltoid, ca. 1 mm; petiole subequal in length, 2-5 mm; leaf blade abaxially pale green, adaxially greenish, slightly lustrous, elliptic-lanceolate, symmetric, subequal in size, 1.5-4 × 0.5-1 cm, succulent, thick papery when dry, veins sunken adaxially, prominent abaxially, lateral veins 4-6 each side, honeycombed abaxially, cystoliths linear, sparse abaxially, dense adaxially, base obtuse, subrounded, or emarginate, margin slightly thickened, bluntly 3- or 4-serrate, apex attenuate or acute. Inflorescences in upper nodes, compactly spicate, 0.3-0.8 cm; bracts triangular-ovate, ca. 0.5 mm; female inflorescence unknown. Male flower pedicellate or sessile, ca. 1 mm; perianth lobes obovate, connate 1/2 of length, apex acute; rudimentary ovary minute, conic. Fl. Feb-Apr.

W Guangxi, SE Yunnan [N Vietnam].

Shaded moist places in forests in limestone mountains, near streams; ca. 700 m.