Cyperus diandrus umbrella flatsedge Cyperaceae CYDI; Bx, pb; Q, j; R;

Cyperus diandrus.Donald Cameron.New England Wild Flower Society.gobotany.newenglandwild.org

Cyperus diandrus.Donald Cameron.New England Wild Flower Society.gobotany.newenglandwild.org (Accessed 4/2014).

Cyperus diandrus is an annual C4 sedge (Li et al. 1999), tufted, 10-20 cm tall, stems slender. 

Leaves often as long as flowering stem; inflorescence bracts 3, the lowest to 15 cm long, stalks of spikes (rays) 1-3, to 6 cm long. 

Flower spikelets reddish-brown to greenish, 6-10 per spike, 0.8-1 cm long, 0.2-0.3 cm wide, very flat, scales egg-shaped, about 0.3 cm long, becoming red-purple at tip and along margins, colorless along midrib,

Fruit: achenes lens-shaped 0.1 cm, style persistent; blooms and fruits June-Oct. 

Wetland status: FACW. 

Frequency in NYC: Very infrequent. 

Origin: Native. 

Habitat: Wet soil, shores.