Cyperus involucratus

風車草

naturalized

Cyperus involucratus Rottb.

名彙資訊

特徵描述

典藏標本

數位照片

分布位置

相關資訊

Rottb., Descriptiones Plantarum Rariorum 22. 1772. (Descr. Pl. Rar.)

Cyperus alternifolius L. var. flabelliformis (Bockeler) T. Koyama

Koyama, Quarterly journal of the Taiwan Museum 14: 177. 1961. (Quart. J. Taiwan Mus.)
Cyperus alternifolius L. ssp. flabelliformis (Rottb.) Kük.

Koyama, Flora of Taiwan 5: 270. 1978. (Fl. Taiwan)
Cyperus alternifolius L.

Chen, The Invasive Alien Plant in Miaoli 290. 2006. (Invas. Al. Pl. Miaoli)

中

輪傘草. 傘草. 車輪草. 傘葉莎草. 輪傘莎草.
英

Umbrella papyrus. Umbrella palm. Palm crown. Umbrella flat sedge. Umbrella plant.
日

しゆろがやつり.

herb

Tall perennial with short, woody rhizome.
Culms subdensely tufted, 50-150 cm tall, obtusely trigonous to nearly terete below, scabrous below corymb, clothed at base with bladeless sheaths only; basal sheaths pale green, 10-20 cm long, obliquely truncate at orifice, lower ones cataphylloid, yellowish brown.
Corymbs ample, subdense, 15-30 cm across, decompound; primary rays numerous slender, 7-10 cm long, each bearing 4-10 raylets 1-1.5 cm long; leafy bracts many, nearly equal in length, ca. twice as long as corymb, stiffish, flattish, 2-12 mm wide, sub-abruptly acute at apex. Spikelets clustered at apices of raylets, lanceolate-oblong to elliptic, flattened, 3-9 mm long, 1.7-3 mm wide, densely 6-30-flowered, light green; rachilla not winged.
Glumes ovate, acute at apex, ca. 2 mm long, membranaceous, palegreen and variegated with rusty brown, 3- or 5-nerved, keel prominent. Achenes obovate-elliptic, trigonous, 1/3 to 1/4 as long as glume, maturing brown; style nearly; as long as achene; stigmas 3, elongated. Stamens 3.