21G Cyperaceae Carex 



Spikes numerous, yellowish or brownish at maturity; leaf sheaths often 

 red-dotted ventrally. 

 Perigynia plano-convex, thin, yellowish; bracts mostly much exceeding 

 the spikes; leaf sheaths usually transversely rugulose ventrally. 



5. § MULT1FLORAE, p. 224. 



Perigynia thick-plano-convex or unequally biconvex, brown; bracts 

 mostly shorter than the spikes ; leaf sheaths not transversely 



rugulose 6. § Paniculatae, p. 225. 



Perigynia tapering into the beak or, if abruptly contracted, culms flaccid and 



flattening in drying 7. § Vulpinae, p. 226. 



Spikes not androgynous or, if so, perigynia subterete and spikes only 1-3- 

 flowered. 

 Perigynia without winged margins, at most thin-edged. 

 Perigynia 2-4 mm long. 



Perigynia not thin-edged, ascending or appressed, elliptic 



8. § Heleonastes, p. 229. 



Perigynia thin-edged, spreading, ovoid, usually broadest below the 



middle 9. § Stellulatae, p. 230. 



Perigynia 4-5 mm long, narrowly lanceolate, appressed 



10. § Deweyanae, p. 232. 



Perigynia with winged margins 11. § Ovales, p. 232. 



Lateral spikes peduncled or, if sessile, elongate; terminal spike usually staminate. 

 (Eu-Carex.) 

 Style articulated with the achene, at length deciduous; perigynia not lustrous. 

 Lowest bract long-sheathing; perigynia pulverulent or golden yellow at ma- 

 turity 19. § Bicolores, p. 244. 



Lowest bract sheathless or rarely short-sheathing, perigynia not pulverulent 

 or golden yellow. 

 Achenes not constricted in the middle; scales not long-awned, 1-nerved. 



34. § Acutae, p. 260. 



Achenes constricted in the middle; scales long-awned, 3-nerved 



35. § Cryptocarpae, p. 262. 



Style continuous with the achene, persistent, indurated; perigynia lustrous 



40. § Vesicariae, p. 267. 



Stigmas three; achenes triangular. 

 Perigynia pubescent or scabrous. 



Style articulated with the achene, at length deciduous. 



Achenes closely enveloped by the perigynia; bracts sheathless or nearly so. 

 Perigynia obtusely triangular or orbicular-triangular in cross section; plant 



(except perigynia) glabrous 14. § Montanae, p. 238. 



Perigynia sharply triangular; plant pubescent. . . . 17. § Triquetrae, p. 243. 

 Achenes not closely enveloped by the perigynia or, if so, the bracts strongly 

 sheathing. 

 Bracts sheathing, their blades absent or rudimentary; achenes closely en- 

 veloped by the perigynia 15. § Digitatae, p. 242. 



Bracts with well-developed blades. 



Bracts sheathless or the lower short-sheathing. 

 Perigynia pubescent. 



Beak of perigynium at most shallowly bidentate; styles very short, 



thickish; leaves not septate-nodulose. .29. § Virescentes, p. 257. 



Beak of perigynium strongly bidentate; styles long, slender; leaves 



septate-nodulose .' 30. § Hirtae, p. 258. 



Perigynia scabrous 30a. § Anomalae, p. 259. 



Bracts, at least the lower ones, long-sheathing. 



Beak of perigynium not strongly bidentate ... 21. § Laxiflorae, p. 246. 



Beak of perigynium strongly bidentate 30. ij Hirtae, p. 258. 



Style not articulated, continuous with the achene, persistent, indurated. 



Perigynia less than 1 cm long; spikes cylindric 38. § Paludosae, p. 264. 



