192 CYPERACEAE 



ceous. V 2 to 2 inches long; spikelets linear-oblong, iy 2 to 3 lines long, in a 

 dense compound head or in close clusters on 2 or 3 short (14 to 1 inch long) 

 rays; rachis not winged; scales 7 to 9-nerved, with strongly recurved seta- 

 ceous tips, chestnut-brown or greenish, % to 1 line long; achene 3-angled. 



San Jacinto Mts., Hall 2663; San Bernardino Valley, Parish; Mohave River, 

 ace. Parish; Tehipite Valley, 4000 feet alt., Hall & Chandler 510; Yosemite, 

 Bolander 6223; Hetch-Hetchy, Jepson 3479; Jackson, Hansen 643; Chico, 

 Greene, Copeland 3489; north to British Columbia and east to the Atlantic 

 States. South America, Africa, Asia, Australia. 



Refs. CYPERUS AKISTATUS Eottb. Desc. Nov. PI. 22 (1773). C. inftexus Muhl. Gram. 16 

 (1817). 



5. C. acuminatus Torr. & Hook. Annual; stems slender, tufted, 5 to 12 

 inches high ; leaves commonly less than 1 line wide ; bracts of the involucre 2 

 or 3, much elongated; spikelets 3 or 4 lines long, capitate on the rays or the 

 whole inflorescence congested and head-like; scales oblong, obscurely 3-nervcd, 

 with a short recurved tip ; achene 3-angled, about x /2 as long as scale. 



Round Meadow, Giant Forest, Grant 2436; Tulare Co., Congdon, ace. Brit- 

 ton ; Oregon, Washington ; Arizona east to Louisiana and Illinois. 



Refs. CYPERUS ACUMINATUS Torr. & Hook. Ann. Lye. N. Y. 3:435 (1836); Britton, Bull. 

 Torr. Club, 13:209 (1886). 



6. C. virens Michx. Perennial; stems triangular, 1 to 3 feet high; involu- 

 cral bracts 4 to 6, very long and leafy, broad and strongly keeled ; umbel com- 

 pound, or the spikes capitate on the rays, or the whole often much reduced 

 and subcapitate ; spikelets numerous, many-flowered, long-oblong, 4 to 8 lines 

 long; scales concave-carinate, serrulate on back at apex, 1 line long; achene 

 3-angled. 



Mt. Shasta, Grant; Chico, Copeland 3490; lone, Braunton 1012; Grand Island. 

 Jepson; Healdsburg, King; Berkeley, Walker 434; San Francisco, Bioldli: 

 Los Gatos, Heller 7487 ; Kings River, Lemmon; San Bernardino, ace. Parish. 

 East to North Carolina and south to Central America. 



Befs CYPERUS VIRENS Michx. Fl. Bor. Am. 1:28 (1803); Wats. Bot. Cal. 2:214 (1880). 

 C. serrulatus Wats. Proc. Am. Aead. 17:382 (1882), type loc. Placer County, George V<i*< u; 

 Jepson, Fl. W. Mid. Cal. 84 (1901). 



7. C. erythrorhizos Muhl. Annual; stems 1 to iy 2 feet high, stout, tri- 

 angular; leaves flat or conduplicate, 6 to 14 inches long, 2 to 3 lines wide; 

 involucral bracts 6 to 8, foliaceous, 4 to 12 inches long; rays 1% inches long 

 or less, bearing umbels of spikes which are i/2 to 1 inch long; bracts of 

 involucels shorter, foliaceous; spikelets usually 2 to 3 lines long, narrowly 

 linear, somewhat crowded, horizontally spreading, nearly flat, bright chestnut- 

 color; rachis clothed with the persistent wings of the scales; scales elliptical, 

 obtuse, mucronulate, % line long ; keel smooth ; achene 3-angled. 



Clear Lake, Bolander 2631 ; Sacramento and San Joaquin valleys along the 

 main rivers. East to the Atlantic States. 



Eefs. CYPERUS ERYTHRORHIZOS Muhl. Gram. 20 (1817); Wats. Bot. Cal. 2:215 (1880); 

 Jepson, Fl. W. Mid. Cal. 85 (1901). 



8. C. sphacelatus Rottb. Annual, similar in habit to the next; steins 

 tufted, slender, 4 to 10 inches high; leaves 1 to 2% lines wide, shorter than 

 the stems; spikelets numerous, densely short-spicate, linear, 1 line wide; rachis 

 at length wingless, the narrow wings early deciduous; scales oblong-lanceo- 

 late, purple-green, several nerved, 1 line long; achenes nearly black, 3-angled, 

 1/2 ^s long as scale. 



JEPSON, Fl. Cal. vol. 1, pp. 190-192, April 30, 1912. 



