ORDKR CXM. CVI'i:RA(M:yE. 567 



§ 2. spikes numerous; iermhial ones sterile or andmgj/nouK, bate 

 staminate. 



22. C. DASYCAu'PA, (Mulil.) Stem triquetrous, t,'l;il)nuH. Lravra 

 very narrow, lanceolate, linear, t^lubrous. SttMJle spike vi-ry sinull, 

 terminal ; scales lanceolate. P^rtile spikes generally 3, near cacli 

 other, upper sessile. — Car. and Geo. 



23. C. TRi'cEPS, (Mich.) Ste^n acutely angled, slender, scabrous alonjjf 

 the margins. Leaves linear, pubescent at the base. Spikes usually 4, 

 approximate, sessile, 3 of them larger than the otlier. Glumes ovjit*-. 

 Palece shorter than the glume, glabrous. Fruit ovate, compressed, 3- 

 angled. — li April — May, Damp soils. 12 — 18 inches. 



24. C. hirsu'ta, (Willd.) Stem 3-angleJ, slender, pubescent near the 

 summit. Leaves narrow, slightly pubescent. Spikes 3 — 1, the termi- 

 nal one sterile at the base, lower ones on short peduncles. Fruit ovate, 

 obtuse, — If. May — June, Southern Geo. 10 — 12 inches, 



25. C. buxbau'mii. Stan slender, 3-angled, Leaves narrow, with 

 scabrous margins. Spikes 3 — i, the terminal one, with the lower half, 

 bearing sterile flowers, Ghimes lanceolate, dark-colored. Pa/e<r li;jht- 

 colored, 2cleft at the summit. Fruit elliptic, as long as the glume. — 

 If, Jul}' — Aug. Swamps. 1 — 2 feet. 



§ 3. Staminate spikes solitary or 1 — 3 ; pistillate 1 — 3, generally sessile. 



26. C. va'ria, (Mueh.) Stem erect, slender, with scabrous nngU-s. 

 Leaves subulate. Fertile spikes generally 3, nearly globose ; sterile 

 spike terminal. Glumes oblong-lanceolate, tinged with brown. Palete 

 pubescent. Fruit sub-globose, hispidly pubescent, obtusely 3-angled. 

 — If. April — May. Dry woods. 8 — 12 inches. 



27. C. margina'ta, (Mueh.) Stei7i slender, 3-angled. Leaves linear, 

 with slightly scabrous margins ; fertile spikes generally 2, sub-globose, 

 approximate, the sterile one terminal, cylindrical, long. Glumes ovate, 

 brown, with a white margin. J^Vuit globose, pubescent, longer than the 

 glume. — If. April— May, Dry soils, 8 — 12 inches, 



28. C. plantagin'ea, (Laiu.) Stem erect, glabrous, with purple 

 sheaths, nearly leafless. Leaves linear, nerved, glabrous. Sterile sjnke 

 terminal ; fertile ones mostly 4, distant, erect, linear, the lower ones on 

 long peduncles. Bracts leafy, sheathing the peduncle. Fruit oblong, 

 cuneiform, recurved at tjie apex. — If, April — May. Shaded soil*. 

 8 — 12 inches. 



29. C. conoi'dea, (Schkuhr.) Stem 3-angled, the angles scabrous. 

 Leaves narrow, flat, scabrous along the margin. Fertile spikes 2—3, 

 remote, the lower ones on long peduncles ; sterile spike terminal, small, 

 with lanceolate glumes; the lower bracts leaf-like. Fruit conical, ob- 

 tuse, recurved at the apex.— ^ . April. Wet soils. About 1 foot 



Yxn. C. tetan'ica, (Ell.) Stem slender, glabrous, 3-angled. leaves 

 linear, shorter than the stem. Fertile spikes 2, distant, the upper ono 

 nearly sessile, the lower on a long peduncle; the st.rile spike on a Iomj; 

 peduncle. Glumes mucronate. Fruit ovate-oblong, acul.- at eadi end, 

 oblique. — If. May, Wet soils, 12 inches, 



30. C, an'ceps, (Much,) Stem 3-angled, compressed, Lravcs broa.l 

 Fertile spikes 3, loosely flowered, cylindric. Bracts shenthing. rru%t 



