568 ORDER CXLI. — CYPERACE^E. 



ovate, 3-angled, acute, narrowed at the base, about as long as the glume. 



— If. April — May. Woods. 12 — 15 inches. 



31. C. laxiflo'ra, (Lam.) Stem 3-angled, with scabrous margins. 

 Leaves narrow-lanceolate, acute, nerved. Sterile spike nearly sessile ; 

 fertile spikes 2 — 3, the lowest one on a long peduncle, the upper one 

 shorter. Glume ovate, cuspidate. Fruit ovate-oblong, longer than 

 the glume, shining, inflated. — If. May. Woods. 12 — 18 inches. 



32. C. granula'bis, (Mueh.) Stem erect or decumbent, glaucous. 

 Leaves narrow, somewhat glaucous. Sterile spike usually solitary; 

 fertile spikes 2 — 3, the lowest pedunculate, the upper nearly sessile. 

 Glumes ovate, acuminate. Palcce nearly orbicular. Fruit nerved, with 

 a short, recurved beak. — %. May. Wet shaded soils. 12 inches. 



33. C. verruco'sa, (Mueh.) Stem glabrous. Leaves very long, acute, 

 nerved. Sterile spikes 3 ; fertile spikes 4—6, erect, cylindrical, sterile 

 flowers at the summit ; lower peduncles longest, the upper nearly sur- 

 rounded by the bracteal leaves ; scales ovate, obtuse. — South Carolina. 



34. C. milia'cea, (Mueh.) Stem slender, 3-angled, with the angles 

 scabrous. Leaves linear, with scabrous margins. Fertile spikes 3, slen- 

 der, filiform, nodding ; bracts of the lower spike longer than the stem, 

 those of the upper small. Glumes emarginate. Fruit ovate, 3-angled, 

 with short beak, longer than the glume. — If. May. Wet grounds. 

 12 — 15 inches. 



35. C. flexuo'sa, (Mueh.) Stem slender, 3-angled, glabrous. Leaves 

 linear, slightly channeled. Sterile spike slender, terminal; fertile spikes 

 4, pendulous, remote, the peduncles sheathed. Glumes lanceolate. 

 Falece striate. Fruit oblong, beaked, double the length of the glrime. 



— If. April — May. Damp soils. 12 inches. 



§ 4. Spikes androgynous ; apex staminate. 



3G. C. Willdenow'ii, (Schkuhr.) Stem triangular, erect. Leaves 

 linear, longer than the stem. Spike terminal, simple, ovate ; sterile and 

 fertile florets about equal in number, about 6. Fruit ovate, nearly te- 

 rete, beaked. Glumes ovate, the inferior ones long and foliaceous, acu- 

 minate. — If. May — June. Dry woods. 6 — 8 inches. 



§ 5. Staminate spikes 2 — 3 ; pistillate as many. 



37. C pelli'ta, (Mueh.) Stem erect, 3-angled. Leaves long, linear. 

 Sterile spikes 2 — 4, the upper ones pedunculate; fertile ones 2 — 3, the 

 upper ones sessile, the lower on erect peduncles. Glumes lanceolate, 

 mueronate. Fruit ovate, 2-cleft, hairy, shorter than the scale. — 1±. 

 April — May. Damp woods. 1 — 2 feet. 



38. C. tricuocar'pa, (Mueh.) Stem erect. Sterile spikes 2 — 4, pe- 

 dunculate; fertile florets 3, pedunculate, erect, cylindric. Fruit ovate- 

 lanceolate, acuminate, pubescent. Glumes ovate, acuminate, shorter 

 than the fruit. — 2f . May. Swamps. 2 — 3 feet. 



39. C. ripa'ria, (Curt.) Stem erect, smooth, 3-angled. Leaves ligu- 

 late, the upper ones without sheaths. Sterile spikes usually 4; fertile 

 spikes 3, erect, with sterile flower at the summit. Glumes chaffy. 

 Fruit ovate, 2-cleft, nerved, shorter than the glume. — If. March — 

 April. Marshes. 1 — 2 feet. 



40. C. glauces'cens, (Ell.) Stem 3-angled, glabrous. Leaves narrow, 

 channeled, serrulate, the lower ones glaucous. Sterile spike solitary, 



