PIPER——-FLORA OF THE STATE OF WASHINGTON. 155 
Spikelets cylindric, the scales spirally arranged. 
Style not enlarged at base. 
Annuals; perianth bristles none... ...-.-.------ Hemicarpna (p. 159). 
Perennials; perianth bristles present. 
Bristles short; barbed. ...........-------- Scirpus (p. 156). 
Bristles long and silky, smooth... ....-.... ERIOopHORUM (p. 158). 
Style enlarged at base. 
Spikelets solitary on a scape ......-.---.------- ELEOCHARIS (p. 159). 
Spikelets not solitary; stems leafy... 2.2.2.2... -- Riryncnospora (p. 161). 
. 
CYPERUS. 
rachis not winged; annuals. 
Scales tipped with recurved awns........-...-.--------------- 1. C. inflerus. 
Seales acuminate, not awned__...-...-2..22-.-.-2------------ 2. C. acuminatus. 
Rachis winged. 
Wing of the rachis separating from it as seales; annual.......--. 3. C. erythrorhizos. 
Wing of the rachis persistent. 
Perennial with corm-like tubers........-.----------------- 4. C, strigosus. 
Perennial by rootstocks bearing nut-like tubers......2.-.--- 5. C. esculentus, 
1. Cyperus inflexus Muhl. Gram. 16. 1817. 
Cyperus aristatus Rottb. err. det. Boeckl. Linnaea 35: 500. 1868 
Type LocaLity: Pennsylvania. 
Rance: British Columbia to Vermont, south to Mexico and Florida. 
SPECIMENS EXAMINED: West Klickitat County, Suksdorf 81; Kalama, Piper, October 31, 
1901; Cascade Mountains, Tweedy 38; Parker, Dunn, August 8, 1901; Lake Chelan, E/mer 
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, Lake d& Hull 369; Mission, 
Kreager 493: Toppenish, Cotton 803; Prosser, Cotton 644. 
ZONAL DISTRIBUTION: Upper Sonoran and Arid Transition. 
2. Cyperus acuminatus Torr. & Hook. Ann. Lyc. N. Y. 3: 435. 1836. 
TyPE Loca.ity: ‘ Near St. Louis, Missouri.” 
Rance: 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. Haenk. 1: 172. 1828. 
Tyre Locauity: Pennsylvania. | 
Rance: Washington to Massachusetts, south to Florida and California. 
SPECIMENS EXAMINED: West Klickitat County, Suksdorf 221, 222, 587; Parker, Dunn, 
August 8, 1901; Almota, Piper, 1937; Vancouver, Sheldon, 11274. 
ZONAL DISTRIBUTION: Upper Sonoran. 
4. Cyperus strigosus L. Sp. PI. 1: 47. 1753. 
Tyee cocauiry: “ Habitat in paludibus Jamaicae, Virginiae.”’ 
Rance: Washington to Maine, south to Texas and Florida. 
SPECIMENS EXAMINED: West Klickitat County, Suksdorf 1261, 84, September 15, 1886. 
This was listed by Suksdorf as ‘ C. incompletus Link? ” 
5. Cyperus esculentus L. Sp. Pl. 1: 45. 1735. Nut Grass. 
Cyperus phymatodes Muhl. Gram. 23. 1817. 
Tyre Locauity: ‘Habitat Monspelii, inque Italia, Oriente.” 
