Pilea boniana Gagnep.

Herbs perennial, creeping rhizomatous, dioecious or monoecious, Stems glabrous. 15-100 cm tall, succulent, but woody at base, Stipules almost persistent, interpetiolar, deltoid, ca. 1 mm, herbaceous; petiole 0.6-5(-7) cm; leaf blade abaxially often purplish, often elliptic, sometimes elliptic-lanceolate, oblong-elliptic, or oblong-ovate, symmetric, often unequal or subequal in size, (1-)3-16 × (0.8-)1.5-7.5 cm, 3-veined, lateral veins 6-10 each side, glabrous adaxially, base broadly cuneate or rounded, margin crenate-serrulate or indistinctly undulate-crenate distally, rarely entire, apex cuspidate, acuminate, or acute. Inflorescence a cyme, racemelike or paniculate, spreading, 6-16 cm overall, peduncle 4-10 cm; female inflorescences captitate. Male flowers pedicellate, in bud obovoid, truncate at top, 1.5-2 mm in diam.; stamens 5; rudimentary ovary minute, conic or linear. Female perianth lobes oblong or boat-shaped; staminodes oblong. Achene rhombic-ovoid, ca. 2 mm, compressed, slightly elevated by margin, verrucose, enclosed by perianth lobes subequal to achene. Fl. Jul-Mar, fr. Sep-Jul.

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

Rock crevices in limestone mountain forests; 300-2200 m.

Pilea baviensis Gagnepain; P. morseana Handel-Mazzetti; P. pentasepala Handel-Mazzetti.

Pilea boniana là loài thực vật có hoa trong họ Tầm ma. Loài này được Gagnep. miêu tả khoa học đầu tiên năm 1928.

五萼冷水花（学名：Pilea boniana）是荨麻科冷水花属的植物。分布在越南以及中国大陆的云南、广西、贵州等地，生长于海拔300米至2,200米的地区，常生长在石灰岩山坡山谷林下以及林缘岩石上，目前尚未由人工引种栽培。