Dulichium arundinaceum three-way sedge Cyperaceae DUAR; R bm (planted), gb;

 

Dulichium arundinaceum plants. 2005 © Peter M. Dziuk. Minnesota Wildflowers. minnesotawildflowers.info

Dulichium arundinaceum plants. 2005 © Peter M. Dziuk. Minnesota Wildflowers. minnesotawildflowers.info (Accessed 4/2018).

Dulichium arundinaceum is a perennial C3 sedge (Pascal-Antoine 2008), colonial from rhizomes, 30 cm to 1 m tall. 

Dulichium arundinaceum 3-ranked leaves, plants in bloom. 2011 © Peter M. Dziuk. Minnesota Wildflowers. minnesotawildflowers.info (Accessed 4/2018).

Leaves numerous, in ranks of three up stem, blade 5-15 cm long, 0.3-0.8 cm wide. 

Dulichium arundinaceum flower spikes. 2015 © Peter M. Dziuk. Minnesota Wildflowers. minnesotawildflowers.info

Dulichium arundinaceum flower spikes. 2015 © Peter M. Dziuk. Minnesota Wildflowers. minnesotawildflowers.info (Accessed 4/2018).

Flower spikes 1-3 cm long, spikelets linear 1-2.5 cm long, ranked along axis, scales 0.5-0.8 cm base extending down axis as wings, achene about 0.3 cm long-beaked with long persistent style; inflorescences ranked along stem in leaf axils; stalks short; blooms and fruits July-Oct. 

Wetland status: OBL. 

Dulichium arundinaceum spikelet, scale. achene. © MinnesotaWildflowers.info

Dulichium arundinaceum spikelet, scale. achene. © 2015 MinnesotaWildflowers.info (Accessed 4/2018).

Frequency in NYC: Very infrequent. 

Origin: Native. 

Habitat: Open marshes, soil pH 4.7-7.5 (USDA, NRCS 2010). 

Notes: Apparently formerly abundant (DeCandido 2001).