生活型

herb

形態特徵

• Stemless annuals.
• Leaves radical, many, linear, ribbonlike, glabrous, 2-8 cm long, 2-5 mm wide, apex acute to attenuate, 6-11-nerved; peduncles numerous, (7-)15-38 cm long, 4-5-ribbed, twisted, sheath tubular, bladeless, glabrous, 2.5-7.5 cm long, apex oblique; heads hemispherical, 3-4 mm long, 4-5 mm in diam.; involucral bracts obovate, membranaceous, pale brown, glabrous, 2.5-3 mm long, 1.1-1.8 mm wide, apex obtuse; receptacle densely pilose; floral bracts obovate to oblanceolate, membranaceous, black, apex deltoid, 2-2.5 mm long, 0.8-1 mm wide, densely white clavate hairy on upper margin and on back.
• Staminate flowers: calyx spathe-like, open on one side, obovate, blackish, 2 mm long, 0.6-0.8 mm wide, shallowly or deeply trilobate, with white clavate hairs on upper margin and on back; corolla lobes 3, with few white clavate hairs at apex; anthers 6, black. Pistillate flowers: sepals 3, free, oblanceolate-linear, black, 2 mm long, apex acute, with white clavate hairs on upper margin and on back; petals 3, oblanceolate-linear, free, pale yellow, 1.7 mm long, sparsely white clavate hairy; ovary 3-locular, glabrous; stigmas 3, as long as length or longer than style.
• Seeds ellipsoid, 0.4-0.5 mm long, pale brown, transversely reticulate with T-shaped appendages.

分布

• 台灣 : marshes in the center and north.
• 世界 : China.

引證標本

TAIPEI: Peitou, Nakai 4221. NANTOU: Kawakami s. n. 1913 (Isotype, TAIF); Sun Moon Lake, Suzuki 6716a; Kudo & Sasaki 15387; Puli, Kawakami s. n. 1910.

參考文獻

• LI, Sung-Po and HSIEH, Chang-Fu, Flora of Taiwan, second edition 5: 184. 2000.  (Fl. Taiwan 2nd edit.)