Pilea howelliana Hand.-Mazz.

Herbs perennial, stoloniferous, glabrous, monoecious or dioecious. Stems gray-green when dry, 15-100 m tall, succulent, swollen between nodes. Stipules persistent, triangular, ca. 1 mm, membranous; petiole subequal in length, 1-5 cm; leaf blade abaxially purplish, adaxially often pale green, narrowly ovate, asymmetric, subequal in size, 5.5-14 × 2.5-6 cm, herbaceous, 3-veined, whitish, conspicuous, lateral veins 10 each side, external secondary veins anastomosing by margin and reaching to serrate tips, cystoliths fusiform, often abaxially, conspicuous, base subrounded, margin shallowly crenate, apex acuminate. Inflorescences sometimes androgynous, solitary, a paniculate cyme, 9-14 cm overall, peduncle 5-14 cm. Male flowers subsessile, in bud ca. 1.2 mm; perianth lobes 4, narrowly ovate, apex acute; stamens 4; rudimentary ovary minute. Female flowers subsessile, in bud ca. 0.8 mm; perianth lobes connate at base, subequal, abaxial lobe larger, subapically corniculate; staminodes 3, squamiform, oblong. Achene brownish, broadly ovoid, ca. 1 mm, slightly compressed, almost not oblique, with a strongly elevated convex lens ring by margin. Fl. Jul-Aug, fr. Sep-Nov.

S and W Yunnan.

* Broad-leaved forests, shaded wet places, near streams, rocks; 1500-2500 m.

Pilea howelliana là loài thực vật có hoa trong họ Tầm ma. Loài này được Hand.-Mazz. miêu tả khoa học đầu tiên năm 1929.

泡果冷水花（学名：Pilea howelliana）为荨麻科冷水花属的植物，为中国的特有植物。分布在中国大陆的云南等地，生长于海拔1,500米至1,700米的地区，多生于山谷河边林下阴处石上，目前尚未由人工引种栽培。