生活型

herb

形態特徵

• Stemless annuals.
• Leaves radical, many, linear, ribbonlike, glabrous, 2-10 cm long, 2-5 mm wide, apex acute to attenuate, 6-10-nerved; peduncles numerous, (5-)7-19 cm long, 4-6-ribbed, twisted, sheath tubular, bladeless, glabrous, (1.8-)2.2-5(-7) cm long, apex oblique; heads hemispherical, 2-3 mm long, 4-5 mm in diam.; involucral bracts oblong to obovate, membranaceous, pale brown, glabrous, apex obtuse, 2 mm long, 1 mm wide; receptacle glabrous to sparsely pilose; floral bracts obovate, glabrous, black on upper part, membranaceous, apex acute, base cuneate, 2 mm long, 1 mm wide.
• Staminate flowers: calyx spathe-like, open on one side, obovate, glabrous, black on upper part, 2 mm long, 0.6-0.9 mm wide, apex bilobate or deeply bilobate or slightly trilobate; corolla lobes 3, with black glandes and few clavate hairs at apex; anthers 6, black. Pistillate flowers: sepals 2, free, linear, black or pale brown, glabrous, 1.2-1.5 mm long, apex acute; petals 3, oblanceolate-linear, pale brown, 1.2 mm long, pilose on margin and inner, with few white clavate hairs and minutely glandular at apex; ovary 3-locular, glabrous; stigmas 3, longer than style.
• Seeds ellipsoid, pale yellow, 0.4 mm long, with retangular reticulations of ribbon-like bands.

分布

• 台灣 : rice paddies and other wet places throughout the island.
• 世界 : The Philippines, Thailand, Sri Lanka, India, Japan and southern China.

引證標本

KEELUNG: Kawakami s. n. 1910. TAIPEI: Kungliao, Fulung, Li 721, Homei, Li 725; Nankang, Lin s. n. 1998; Neihu, Lin s. n. 1999; Hsichih, Hsinshanmenghu, Lin s. n. 1999; Pachihlan, Kawakami & Shimada s. n. 1909; Sungshan, Masamune 2469; Kanko, Yamamoto s. n. 1938; Sanhsia, Erchiu, Shimada 1038. TAOYUAN: Kawakami s. n. 1913. HSINCHU: Lienhuashih Temple, Li 575; Chupei, Shanchiao, Chaw 349. MIAOLI: Tunglo, Li 657. NANTOU: Sun Moon Lake, Kudo & Sasaki 15631. CHIAYI: Mito, Lin s. n. 1999. PINGTUNG: Lake Nanjen, Koyama & Kao 8610; Huang 9567; Li 261. TAITUNG: Lanyu, Sasaki s. n. 1910.

引用文獻

• LI, Sung-Po and HSIEH, Chang-Fu, Flora of Taiwan, second edition 5: 186. 2000.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)