Cyperus schweinitzii Schweinitz’s flatsedge Cyperaceae CYSC; Q, j; K, m;

 

Cyperus schweinitzii.Steve Garske.New England Wild Flower Society.gobotany.newenglandwild.org

Cyperus schweinitzii. Copyright © 2014 Steve Garske.New England Wild Flower Society.gobotany.newenglandwild.org (Accessed 4/2014)

Cyperus schweinitzii is a perennial C4 sedge (Li et al. 1999), from a knotty root crown, 10 cm to 1 m tall, stem rough, sharply angled, 0.2 cm thick. 

Leaves basal, 0.2-0.8 cm wide, margins rough; bracts below inflorescence upward pointing, usually longer than inflorescence. 

Flower spikelets with 5-18 flowers, flattened, 0.5-2.5 cm long, 0.3-0.4 cm wide, all pointing upward; flower scale broad, about 0.3 cm long, tip pointed veins numerous, conspicuous; Inflorescence of several clusters of spikes, the lowermost stalkless, the upper spikes 10 cm tall or less, crowded.

Fruit a dark achene, 3-sided, 0.2-0.3 cm; blooms and fruits July-Sept. 

Wetland status: FACU. 

Frequency in NYC: Rare (NYS S3, R). 

Origin: Native. 

Habitat: Open, dry sandy soil, coastal.