生活型

herb

形態特徵

• Annual herbs to 0.8 m high; stems erect, with green often becoming dark-violet, usually finely hairy.
• Leaves membranaceous, broadly ovate, 5–10 cm long, 3–5 cm wide, main veins 3, acute at apex, cordate or truncate at base, crenate-dentate along margins, roughly and coarsely appressed-pilose on both surfaces; petioles long, slender.
• Both male and female flowers mixed together, light green, in dense cymes; male flowers with perianth campanulate, 4-parted, stamens 4, exserted, opposite perianth-lobes; female flowers with boat-shaped perianth-lobes, ovary somewhat depressed-globose, style sublateral, filiform.
• Achenes 1 mm across, compressed-trigonous, with dispersed minute raised spots, 1-seeded.

物候

Flowers summer and fall.

分布

• 台灣 : In grassy places at low altitudes.
• 世界 : China (S & E), Korea, Japan, the Ryukyus, , Indochina, the Philippines, Malaysia, New Guinea, Australia and North America (eastern and lower midwestern states).

引證標本

TAIPEI: Kogotu & Nanshi, Suzuki 7606; Kueishan, Masamune & Suzuki 37810.

參考文獻

• LIAO, JIH-CHING, Flora of Taiwan, second edition 2: 142. 1996.  (Fl. Taiwan 2nd edit.)