Pilea rotundinucula Hayata

Herbs perennial, rhizomatous, glabrous, monoecious or dioecious. Stems erect or ascending, 20-60 cm tall, succulent, with galls on mid portion of internodes. Stipules persistent, broadly triangular, ca. 1 mm, membranous, veinless; petiole subequal in length, 0.5-4 cm; leaf blade brownish when dry, elliptic- or oblong-lanceolate, subequal in size, 5.5-22 × 1.1-75 cm, membranous to herbaceous, triplinerved or 3-veined, lateral veins many, apical ones conspicuous, transverse, reticulate, prominent abaxially, base cuneate, margin serrulate, sometimes entire, apex acuminate. Inflorescences in pairs, male a dichotomously branched cyme, 2.5-9 cm overall, peduncle 1-3.2 cm; female cymes sometimes compacted into clusters, 0.6-3.5 cm. subsessile or shortly pedunculate. Male flowers pedicellate, in bud obovoid, ca. 2 mm; perianth lobes 4, ovate, connate about 1/2 of length; stamens 4; rudimentary ovary small, conic. Female flowers subsessile, in bud ca. 1.2 mm; perianth lobes connate at base, unequal, abaxial lobe cymbiform, longer, subapically corniculate; staminodes 3, scale-like, oblong. Achene subglobose, 0.7-0.8 mm, slightly compressed, oblique, verrucose. Fl. Apr-Jun, fr. Jul-Sep.

Taiwan.

* Shaded wet places in forests, near streams, sunny roadsides and rocks in moist places; 300-1500 m.

Pilea distachys Yamamoto; P. funkikensis Hayata var. rotundinucula (Hayata) S. S. Ying.

Pilea rotundinucula là loài thực vật có hoa trong họ Tầm ma. Loài này được Hayata miêu tả khoa học đầu tiên năm 1916.

圆果冷水花（学名：Pilea rotundinucula）为荨麻科冷水花属的植物，为台灣的特有植物。分布于台灣低山林下阴湿处，目前尚未由人工引种栽培。