Flora of Barro Colorado Island

Cyperus rotundus

 

 

 

 

 

L., Sp. Pl. 45.1753

Nut grass, Purple nutsedge, junco

Slender perennial, 10-60 cm tall. Leaves linear, 2-6 mm wide, usually much shorter than culms. Bracts subtending inflorescence leaflike, short, l-5 cm long; spikes several, lax, on rays to 6 cm long or very short; spikelets linear, 1-3 cm long, bearing 12-30 flowers; scales purplish to black, keeled, obtuse, Achenes ca 1.5 mm long, obovate-ellipsoid, dark, bluntly trigonous. Kenoyer 152, Shattuck 357.

Not seen recently, but to be expected in clearings. Often abundant elsewhere in open areas of the Canal Zone, especially along railroad tracks. Flowers in the rainy season.

Throughout warmer regions of the world. In Panama, known principally from tropical moist forest in the Canal Zone, Bocas del Toro, Panama, and Darien; known also from premontane dry forest in Los Santos and from premontane moist forest in the Canal Zone and Panama.