66 CYPERACEAE. 



14. Aeorastaciiyae. 



Spikes several, short, but dense-flowered, long-peduncled and drooping, 

 somewhat remote, the terminal staminatc, the lateral gynaecandrous; bracts 

 narrow, sheathless; scales dark-colored, lanceolate-acuminate, longer than 

 the perigj'nium, which is stipitate, erect, orbicular to obovate gibbous, papil- 

 lose, nerved, with a short, entire beak; stigmata 3. 



One species. 46. C. niagcllanica. 



15. Cenchrocarpae. 



spikes several, loose-flowered, peduncled, but erect, contiguous, the ter- 

 minal staminate or gynaecandrous, the lateral pistillate ; bracts foliaceous, 

 sheathing; scales dark or greenish; perigynium erect, turgid, glabrous, dis- 

 tinctly several-nerved, the beak short or none ; stigmata 3. 



Terminal spike staminate or gynaecandrous ; perigynium globose, orange-colored, 

 beakless or nearly so. 47- C. aurea. 



Terminal spike staminate ; perigynium obovate, greenish, abruptly beaked, with 

 the orifice hyaline. 48. C. Torreyi. 



16. Leiochlaenae. 



Spike one, lax and few-flowered, androgynous; scales hyaline, mucronate; 

 perigynium erect, pale-green, stipitate with a short beak or beakless. 



Perigynium many-nerved, elliptical, emarginate, beakless. 49. C. polytriclioides. 

 Perigynium oval, two-nerved, shortly beaked. 50. C. Geyeri. 



17. Athrochlaenae. 



Spike one, dense and many-flowered, androgynous, the pistillate portion 

 squarrose at maturity; scales lanceolate to oblong, deciduous; perigynium 

 shining, brown, reflexed at maturity, ovate to linear-oblong, prominently 

 stipitate, nerveless, tapering into a long beak; stigmata mostly 3. 



Rootstock creeping, stoloniferous ; leaves flat ; perigynium ovate, the beak two- 

 lobed. 51. C. nigricans. 



Rootstock caespitose, matted ; leaves very narrow, involute ; perigynium linear- 

 oblong, the beak obliquely cut. 52. C. pyrenaica. 



18. Stenocarpae. 



Spikes several, very dark, dense-flowered, borne on long, capillary pedun- 

 cles, more or less drooping, the terminal gynaecandrous, the lateral pistil- 

 late ; scales very dark, acuminate ; perigynium purplish, erect, attenuated at 

 both ends, compressed, nerveless, the beak long, serrulate, with the orifice 

 oliquely cut to bifid, hyaline ; stigmata 2 or 3. 



One species. 53. C. misandra. 



19. Lamprociilaenae. 



Spike one, short and few-flowered, androgynous ; scales broad, brownish ; 

 perigynium obovate to elliptical, obscurely nerved or nerveless, the beak 

 short, with the orifice entire or obliquely cut; stigmata 3. 



