PIPER FLORA OF THE STATE OP WASHINGTON. 155 



Spikclcts cylindric, the scales spirally arranged. 

 Style not enlarged at base. 



Annuals ; perianth bristles none Hemicarpiia (p. 159) . 



Perennials; perianth bristles present. 



Bristles short ; barbed Scirpus (p. 156) . 



Bristles long and silky, smooth Eriophorum (p. 158) . 



Style enlarged at base. 



Spikelets solitary on a scape Eleocharis (p. 159) . 



Spikelets not solitary ; stems leafy Rhynchospora (p. 161) . 



CYPERUS. 



Rachis not winged; annuals. 



Scales tipped with recurved awns 1. C. inflexus. 



Scales acuminate, not awned 2. C. acuminatus. 



Rachis winged. 



Wing of the rachis separating from it as scales; annual 3. C. erythrorhizos. 



Wing of the rachis persistent. 



Perennial with corm-like tubers 4. C strigosus. 



Perennial by rootstocks bearing nut-like tubers 5. C. esculentus. 



1. Cyperus inflexus Muhl. Gram. 16. 1817. 



Cyperus aristatus Rottb. err. det. Boeckl. Linnaea 36: 500. 1868 



Type locality: Pennsylvania. 



Range: British Columbia to Vermont, south to Mexico and Florida. 



Specimens examined: West Klickitat County, <S'Mtsdor/'81; Kalama, Piper, October 31, 

 1901; Cascade Mountains, Tweedy 38; Parker, Dunn, August 8, 1901; Lake Chelan, Elmer 

 in 1897; Yakima, Henderson, October, 1892; Spokane, Henderson, July, 1892; Almota, 

 Piper, September, 1896, August, 1894; Wawawai, Piper, August 24, 1894; without locality^ 

 Elmer 1069; Pullman, Piper, July, 1894; without locality, LaJce cfe HvU 369; Mission, 

 Kreager 493; Toppenish, Cotton 803; Prosser, Cotton 644. 



Zonal distribution : Upper Sonoran and Arid Transition. 



2. Cyperus acuminatus Torr. & Hook. Ann. Lye. N. Y. 3: 435. 1836. 

 Type locality: "Near St. Louis, Missouri." 



Range: Washington to Illinois, south to California and Texas. 

 Specimens examined: Almota, Piper, August 26, 1894. 

 Zonal distribution: Upper Sonoran. 



3. Cyperus erythrorhizos Muhl. Gram. 20. 1817. 

 Cyperus occidentalis Torr. Ann. Lye. N. Y. 3: 259. 1836. 

 Cyperus cupreus Presl, Rel. Ilaenk. 1: 172. 1828. 

 Type locality: Pennsylvania. 



Range: Washington to Massachusetts, south to Florida and California. 

 Specimens examined: West Klickitat County, Sulcsdorf 221, 222, 587; Parker, Dunn, 

 August 8, 1901; Almota, Piper, 1937; Vancouver, SMdon, 11274. 

 Zonal distribution: Upper Sonoran. 



.4. Cyperus strigosus L. Sp. PI. 1: 47. 1753. 



Type locality: " Habitat in paludibus Jamaicae, Virginiae." 



Range: Washington to Maine, south to Texas and Florida. 



Specimens examined: West Klickitat County, Suksdorfl2&l, 84, September 15, 1886. 



This was listed by Suksdorf as " C. incompletus Link? " 



5. Cyperus esculentus L. Sp. PI. 1: 45. 1735. ' Nut grass. 



Cyperus phymatodes Muhl. Gram. 23. 1817. 

 Type locality: "Habitat Monspelii, inque Italia, Oriente." 



