566 ORDER CXLI. CYPERACE^E. 



ligulate. Spikes numerous, elliptic, crowded ; bract beneath the low- 

 est, very long, overtopping the stem. Fruit bicuspidate, erect, lanceo- 

 late, witli a serrulate margin longer than the glume. — If. May. Wet 

 lands. 1—2 feet. 



13. C. scirpoi'des, (Schkuhr.) Stem erect, slender, slightly 3-angled. 

 Leaves narrow, the lower ones short. Spikes 4 — 6, ovate, the upper- 

 most one clavate. Glume small. Palece ovate, 2-toothed. Fruit ovate, 

 bidentate, longer than the glume. — If. May. Swamps. 6 — 12 in. 



14. C. ster'ilis, (Schkuhr.) Stem obtusely angled, slightly scabrous. 

 Leaves linear, sheathing. Spikes 3 — 6. Fruit ovate-acuminate, 3-an- 

 gled, compressed; apex recurved, bicuspidate. — If. May. Marshes. 

 8 — 12 inches. 



15. C. festuca'cea, (Schkuhr.) Stem erect, slender, sometimes decum- 

 bent. Leaves narrow. Flowers in linear spikes, 5 — 8, approximate. 

 Bracts small. Glumes lanceolate, membranaceous. Fruit beaked, 

 winged, serrulate along the margins, white or green. — If. May. 

 Damp soils. 2 — 3 feet. 



§ 4. Staminate and pistillate spikes distinct. 



16. C. Florida'na. Spikes distinct; staminate ones solitary, sessile, 

 small; pistillate ones aggregate, ovate, sessile, bracteate ; lower ones 

 more remote. Fruit oval, compressed, beaked ; scales ovate-oblong. — 

 Florida. 



11. C. cespito'sa, (L.) Stem erect, slender, 3-angled, striate. Leaves 

 linear, acute, with scabrous margins. Fertile spikes cylindrical, gener- 

 ally 3, nearly sessile, sometimes with sterile florets at the summit. 

 Bracts long. Fruit ovate, obtuse, longer than the glume. — 2f . May. 

 In bogs. 12 — 18 inches. 



18. C. aou'ta, (Good.) Stem 3-angled, scabrous. Leaves narrow, with 

 scabrous margins ; the upper ones sessile, the lower sheathing. Sterile 

 spikes 1 — 3 ; fertile 3 — i, nodding, cylindrical, the upper ones sessile, 

 with sterile florets at the summit. Glumes acute. Palece ovate, entire. 

 Fruit oblong. — If. April — May. In bogs. 1 — 2 feet. 



19. C. crin'ita, (Lam.) Stem acutely angled, concave, serrulate. 

 Leaves channeled, glabrous. Fertile spikes 3 — 4, pendulous, each gen- 

 erally terminated by a number of sterile florets. Glumes ovate, with a 

 subulate point. Palece ovate, not divided at the summit, shorter than 

 the glume. Fruit elliptic, with a short beak, shorter than the glume. 

 — 2f . April — May. In swamps. 1 — 2 feet. 



II. STYLE TRIFID. 

 § 1. Spikes solitary, androgynous, apex staminate. 



20. C. Fiuseria'na. Spikes simple ; scales obovate, oblong, obtuse, 

 smooth. Fruit ovate, ventricose, beak short. — Carolina and northward. 



21. C. squarro'sa, (L.) Stem triangular, scabrous along the margin. 

 Leaves narrow, glabrous, with scabrous margins. Spikes mostly simple, 

 sometimes 2 — 3, cylindrical, oblong, very thick. Glumes at the base 

 sterile, lanceolate, slightly colored, those of the summit fertile.. Fruit 

 imbricate, smooth, bidentate, longer than the glume. — 2f . May — June. 

 In bogs. 1 — 2 feet 



