生活型

herb

形態特徵

• Stemless annuals.
• Leaves radical, many, linear, ribbonlike, glabrous, (5-)16-40 cm long, (4-)7-10 mm wide, apex attenuate, 9-23-nerved; peduncles numerous, glabrous, (8.5-)16.5-40 cm long, 4-6-ribbed, twisted, sheath tubular, bladeless, glabrous, (2.5-)4-11(-16) cm long, apex oblique; heads subglobose, 4-6 mm long, 5-7 mm in diam.; involucral bracts broadly ovate, pale brown, hard, glabrous, 2-2.2 mm long, 2 mm wide, apex obtuse to rounded; receptacle glabrous; floral bracts broadly obovate, 2.2-2.8 mm long, 2-2.8 mm wide, apex deltoid, densely white clavate hairy, base cuneate.
• Staminate flowers: calyx connate into a tubiform structure, membranaceous, pale brown, glabrous, 2.5 mm long, 1 mm wide; corolla lobes 3, pale brown, white clavate hairy at apex; anthers 5 or 6, ellipsoid, black. Pistillate flowers: sepals 2, free, boat shaped, glabrous, pale brown, 2 mm long, 0.9 mm wide, apex irregular dentate, widely winged; petals 3, free, linear, pale brown, 1.8 mm long, with few white clavate hairs at apex; ovary 3-locular, glabrous; stigmas 2 or 3, shorter than style.
• Seeds ovate, 0.8 mm long, with transverse reticulations and T-shaped appendages.

分布

• 台灣 : rice paddies and other wet places.
• 世界 : Japan, China, India, Sri Lanka, Thailand, Malaysia, and the Philippine.

引證標本

TAIPEI: Kungliao, Li 727; Yanliuo, Huang 14210; Yangmingshan National Park, Tsuitsuiku, Chen & Liu s. n. 1993; Pachihlan, Kawakami & Shimada s. n. 1909; Peitou, Tanaka s. n. 1930; Murakami 43; Shimada s. n. 1917; Chili, Masamune 2671; Shihlin, Suzuki & Kohasigawa 4818; Odashima 13575; Wuchihshan, Shimada 730; Nakai 4047; Wanli to Neisuanchih, Kuo 8860; Hsichih, Hsinshanmenghu, Li 651. TAOYUAN: Daitikuisho, Kawakami & Sasaki s. n. 1909 (Isotype of Eriocaulon pterosepalum Hayata, TAIF); Liu s. n. 1939; Suzuki 11765; Kawakami & Sasaki s. n. 1909; Sasaki s. n. 1923; Nankan, Hosokawa 1180; Tachi to Tauyan, Hosokawa 1179; Toen to Nankan, Yamamoto s. n. 1929; Hsu s. n. 1960; Bentenike, Shimada 1402; Chungli, Kawakami s. n. 1914; Tachiuyuan, Kawakami & Sasaki s. n. 1910; Pachieh, Hayata s. n. 1915. HSINCHU: Kawakami s. n. 1909; Hsinchiaoshih, Huang & Huang 12697; Hsu 15188; Kao 8667; Temple Lienhuashih, Huang & Huang 8329. TAICHUNG: Tachia, Tiehchenshan, Suzuki 21424.

引用文獻

• LI, Sung-Po and HSIEH, Chang-Fu, Flora of Taiwan, second edition 5: 184. 2000.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)