Pilea swinglei Merr.

The plants are used medicinally to relieve fever.

Herbs weak, glabrous, monoecious. Stems simple or branched, 7-30 cm tall, 1-3 mm in diam., succulent. Stipules soon deciduous, triangular, minute, ca. 1 mm, membranous; petiole subequal in length, 0.5-3 mm; leaf blade abaxially pale green with dense purplish dots, adaxially greenish, broadly ovate or trianglular-ovate, subequal in size, 1-5.5 × 0.8-3 mm, succulent, thinly papery when dry, lateral veins 2 or 3 each side, indistinct, sunken adaxially, prominent abaxially, abaxial surface honeycombed, cystoliths linear, often conspicuously along margin adaxially, base cordate or subtruncate, margin often serrate or crenate, sometimes proximal ones entire, apex acute, sometimes acuminate or obtuse. Inflorescence male simple or few-branched; often longer than the subtending leaf; glomerules 2-4, 2-5 mm in diam., remote; female spike shorter than leaves; bracts oblong-lanceolate, ca. 0.4 mm. Male flowers yellow-green, pedicellate or sessile, in bud ca. 1 mm; perianth lobes oblong-obovate, connate at base, subapically 2-corniculate; stamens 4; rudimentary ovary minute. Female flowers light green, pedicellate; perianth lobes 2(or 3), very unequal, abaxial lobe cymbiform, slightly shorter than achene, adaxial lobe ovate, 1/5 as long as abaxial lobe, membranous; staminodes oblong, 1/2 of length of fruit. Achene light brownish, sometimes with indistinctly dotted colored ring by margin, ovoid, ca. 0.5 mm, slightly compressed, oblique, smooth. Fl. Jun-Aug, fr. Aug-Nov.

S Anhui, Fujian, Guangdong, NE Guangxi, E Guizhou, W Hubei, Hunan, Jiangxi, Zhejiang [Myanmar].

?Mossy rocks in moist shaded places in forests; 400-1500 m.

Pilea crateriforma Metcalf; P. henryana C. H. Wright; P. peploides (Gaudichaud-Beaupré) J. D. Hooker & Arnott var. minutissima Hsu.

Pilea swinglei là loài thực vật có hoa trong họ Tầm ma. Loài này được Merr. miêu tả khoa học đầu tiên năm 1918.

三角形冷水花（学名：Pilea swinglei）是荨麻科冷水花属的植物，是中国的特有植物。分布于中国大陆的湖北、广东、湖南、安徽、江西、浙江、贵州、福建、广西等地，生长于海拔400米至1,500米的地区，多生长在山谷溪边和石上阴湿处，目前尚未由人工引种栽培。