Pilea longipedunculata S. S. Chien & C. J. Chen

This species is is easily confused with Pilea anisophylla, which is characterized by the very unequal leaves, the smaller leaves almost sessile, and the smooth achenes.

Herbs perennial, stoloniferous, glabrous, dioecious. Stems green-blue when dry, 30-60 cm tall, succulent, swollen between nodes, cystoliths dense. Stipules persistent, narrowly triangular, 2-4 mm, membranous; petiole unequal in length, 1-10 cm; leaf blade abaxially pale green, adaxially dark green, falcate-lanceolate or elliptic-ovate, asymmetric, unequal in size, 8-23 × 2.5-11 cm, membranous, 3-veined, lateral veins many, regularly transverse, external secondary veins anastomosing by margin, cystoliths fusiform often conspicuous adaxially, base subrounded or subcordate, margin entire or shallowly 1-3-crenate-serrate near apex, apex acuminate or long acuminate. Inflorescences solitary, cymose paniculate, 7-21 cm overall, peduncle 5-12 cm. Male flowers subsessile, in bud ca. 1 mm; perianth lobes 4, narrowly ovate, apex acute; stamens 4; rudimentary ovary minute. Female flowers subsessile; perianth lobes connate at base, subequal, abaxial lobe larger, subapically corniculate; staminodes 3, conspicuous, scale-like, oblong. Achene brownish, triangular-ovoid, ca. 1 mm, compressed, slightly oblique at apex, with a strongly elevated convex lens ring. Fl. Jul-Aug, fr. Sep-Nov.

W Guangxi, SW Guizhou, Yunnan [N Thailand, N Vietnam].

Broad-leaved forests, shaded wet places or rocks by streams, near streams; 1400-2800 m.