142 CYPERACEAE 



L 



exceeding the inflorescence, normally sheathless. Perigynia ascending, spread- 

 ing, or even reflexed, membranaceous, smooth, from little to much inflated, 

 suborbicular in cross-section, coarsely manj -ribbed or nerveless, contracted into 

 a beak, the beak entire to bidentate. Achenes much shorter than the perigj-nia, 



triangular or lenticular, continuous with the usually tortuous style. Stigmas 3 

 or 2. J J £, 



155. C. miliaris ISIichx. Culms 3-6 dm. tall, smooth, little filamentose at 

 the base; leaf-blades 2 mm. wide; staminate spikes 1 or 2; pistillate spikes 1-3, 

 oblong-cylmdric, 8-25 mm. long, 5-7 mm. wide; perigynia at most faintly nerved, 



iri. ^^- ^°"F' exceeding the scale. Border of lakes and streams: Lab.— Me.— 

 rs.C Boreal. Jl-Au. 



K ^ol' ^' ^^?f^^l^s L. Cubns 3-8 dm. tall, more or less roughened; leaf-blades 

 1.5-3 5 mrn. wide; staminate spikes 1 or 2; pistiUate spikes 1 or 2, separate, oblong- 

 cylindric, 1.5-3.5 cm. long, 6-8 mm. wide, closely 25-75-flowered; scales ovate- 

 lanceolate, sharp-pointed, brownish with lighter midvoin, hyaline at the apex; 

 perigynia obscurely nerved, 4.5-5 mm. long, 1.75-2.25 mm. wide, exceeding the 

 scales, minutely beaked. C. physocarpa Presl. Arctic and subarctic places: 

 Colo.— Mack.— Alaska; Eurasia. Alp.— Mont. Je-Au. 



157. C. oligosperma Michx. Long-stoloniferous; culms slender, 4.5-9 dm. 

 high, exceeding the leaves; leaf-blades 3 mm. wide, involute in age; staminate 

 spike stalked, linear; pistillate spikes 1-2, subglobose or short-oblong, mostly 

 5-1 o-tlowered; scales acute or slightly mucronate, much shorter than the peri- 

 gynia; perigynia oyoid, inflated, strongly few-nerved, yellowish green, shining, 

 5 in n. long, 3 ratu. in diameter, the beak minutely bidentate. In bogs: Lab.— 

 Pa.— Ind.— Sask. Je-S. 



158. C. Raeana Boott. Culms 3-6 dm. high, verv slender, triangular and 

 roughened above, reddened at the base; leaf-blades flat," 2 mm. wide, little nodu- 

 lose; staminate spikes 1 or 2; pistillate spikes 1-3, narrowly cylindric, 1.5-5 cm. 

 long, 5 mm. wide, short-peduncled; scales lanceolate, acuminate; perigynia 5-6 

 mm. long, closely enveloping the achene, yellowish green, strongly few-nerved. 

 (Probably a form of the next.) Lake and river shores: Me.— Que.— Sask. 



Boreal. Je-Au 



1 A ?• I ^^^^icana L Culms 3-9 dm. high, acutely angled and rough above; 

 leat-blades 3-6 mm. wide; staminate spikes 2-4; pistillate spikes 1-3, sessUe or 

 shoit-peduncled, erect, oblong-cylindric, 2.5-7 cm. long, 6-15 mm. wide, many- 

 Howered; scales ovate or lanceolate, acute, acuminate, or short-awned; perigynia 

 5-S mm. long, yellowish green, 8-10-nerved. C. moniU Tuckerm. Wet mead- 

 ows and swamps: Que.— Pa.— Ohio— Calif.— B.C.; Eurasia. Plain. Je-Au. 



160. C. exsiccata Bailey. Culms 3-10 dm. high, acutely triangular and 

 rough above; leaf-blades 3-6 mm. wide; staminate spikes 2-A; pistillate spikes 

 1-3, sessile or short-peduncled, erect, cyUndric, 2-7 cm. long, 10-14 mm. wide, 

 closely many-flowered; scales ovate, sharp-pointed; perig>'nia 7-9 mm. long, 

 lanceolate tapering into the beak, yellowish green, 8-10-nerved. "C. mirala 

 Dewey Hohn. Wet places: Alaska— Mont.--CaUf. Submont. J^Au. 



„ -^^^ ^•- ^ostrata Stokes. Cuhns stout, 3-12 dm. high; leaf-blades 2-12 mm. 



ro ,cfu ""'r ? ^P'i'''^ ^rt' pistillate spikes 2-4, erect, cylindric, densely flowered, 

 sessile or short-peduncled, 5-15 cm. long, 6-20 mm. wide; scales lanceolate, 

 ™ed or acute; perigynia ovoid, spreading at maturity, few-nerved, 4-8 mm. 



!^^^lf/^ 1^^ aM- ^- ^^'^.'^"^"^ Boott. Boggy places: Lab.-Del.-N.M. 

 —CaM.— B.C.— Alaska; Eurasia. Plain—Mont. Je-S. 



rmiwoJ' K®*''°T .^k)'^- 9''^'^^ ^*°^*' 3-10 ^"^^ liigl^. smooth or slightly 

 S^^i ?■' l^^f-Wades &;10 mm. wide; staminate spikes 1-3; pistillate 

 Sv! 1 'i^'T -'^'!?''' T^ sessile or nearly so, or the lower distant and long- 

 s' wf^ cylindric, densely many-flowered, 2.5-7.5 mm. long, 14-20 mm. mde; 

 scales lanceolate, acute or acummate; perigynia ovoid, few-nei^ed, 7-10 mm. long 



^?.'':"^T^W^*^P^'^T- ^y^^^VvMna Muhl." of Fl. Colo. Swamps and wet 

 places. Nevv-f.-Pa.— la.— Colo.— Wash.— B.C. Plain— Submont Jl-0. 



