生活型

herb

形態特徵

• Annual herbs, erect or ascending.
• Paired leaves equal or subequal, juicy, membranaceous, widely rhombic-obovate to widely depressed-rhombic-obovate, to 8 mm long, 9 mm wide, apex obtuse to truncate, entire or wavy, margins entire, base broadly cuneate, 3-nerved; petioles 2-11 mm long.
• Male inflorescences glomerules with 2-4 flowers, always branched; bracts free, minute, narrowly triangular. Female inflorescences solitary dichotomous, congested glomerules. Male flowers glabrous, shallowly obovoid-obdeltoid; sepals 3 or 4, connate about halfway, valvate, cymbiform, short corniculate. Female flowers green; sepals 2, connate at base, very unequal, large one cymbiform, small one truncate-cymbiform; staminodes 2, minute.
• Achenes asymmetrical, laterally depressed ellipsoid.

物候

Flowering and fruiting throughout the year.

分布

• 台灣 : sunny, moist roadsides, ditches, and open slopes at medium altitudes throughout the central mountains.
• 世界 : Russia (Siberia), Japan, Ryukyus, Korea, N. NE mainland China, and Java?.

引證標本

HSINCHU: Taikogun, Suzuki 20635. CHIAYI: Alishan-Erwanping, Jeng 2224. HUALIEN: Kuanyuan, Peng 14050, Shih 3035; Tzuen, Shih 3254; Hualuchi, Shih 3255.

參考文獻

• YANG, YUEN-PO, SHIH, BING-LING and LIU, HO-YIH. 1996. Flora of Taiwan, second edition 2: 245. (Fl. Taiwan 2nd edit.)