CYFEEACEiE. 907 



{Spikelets rather large, ovoid, in a spike of 1 or 2 inches. Fruit with 

 very thin or winged edges 15. Sand C. 

 Spikelets short, in a spike of about 4 inch. Fruit very convex, not 

 winged 19 



r Spike ovoid, the spikelets distinct. Stem slender, erect. 16. Divided C. 

 19 <! Spike nearly globular, Yery dense. Stem short, curving downwards. 



I 17. Curved C. 



90 f Spikelets short, erect 21 



1 Spikelets oblong or cylindrical, stalked, and drooping 22 



/-Spikelets at length rather distant, the lowest scarcely stalked. Fruit 



ovoid, obtuse 22. Buxbaum's C. 



21 -l 



j Spikelets close together, the lowest stalked. Fruit angular, shortly 



I beaked 21. Alpine C. 



("Spikelets oblong, very black. Fruit triangular, with a short beak. 



> 23. Black C. 



i Spikelets cylindrical, green. Glumes and fruits with long subulate 



L points 43. Cyperus-like C. 



Spikelets several, one or more terminal ones wholly male. 



23 f Stigmas 2 24 



I Stigmas 3 27 



r Spikelets small, green, and distant, lower one branched or clustered. 



24 «{ 11. Axillary C. 



L Spikelets cylindrical or oblong, few, dark-brown or black .... 25 



9 ~ j Fruits very convex or inflated 18. Russet C. 



° \ Fruits nearly flat 26 



r Glumes mostly obtuse. Spikelets 4 to 2 inches long . . 19. Tufted (7. 



26 <( Glumes mostly narrow and pointed. Female spikelets 3 inches or 

 L more 20. Acute C. 



„u f Bracts sheathing, without leafy tips. (Fruits obtuse, slightly downy) 28 

 I Bracts, at least the lower ones, leafy, with or without sheaths ... 29 

 r- Stems shorter than the leaves. Female spikelets short, distant, half- 

 included in the sheaths 24. Dwarf C. 



28 X 



J Stems longer than the leaves. Female spikelets near the top, linear, 



L spreading 25. Fingered C. 



9Q f Fruits downy or hairy 30 



l Fruits glabrous 35 



„„ f Female spikelets short and compact, close under the males .... 31 



I Female spikelets oblong or cylindrical, the lower ones distant ... 33 

 o-i f Lowest bract shortly sheathing, with a short leafy point . . Vernal C. 



1 Lowest bract shortly leafy, without any sheath 32 



on / Fruits not above a line long, very shortly downy . 28. Pill-headed C. 



L Fruits near 2 lines long, hairy 27. Mountain C. 



rBracts without any or with very short sheaths 34 



33 <{ Bracts with long sheaths. Fruits hairy, beaked, 2 lines long. Spike- 



L lets very distant 31. Hairy C. 



