LXXXVIII. CYPERACE.E. 489 



a ( Terminal sptkelet male at the base. Spike simple ... . . 7 



\ Terminal spikelet male at the top. Spike often branched or compound . . IS 



(Spikelets forming r>. terminal spike without leafy bracts, or with only a small 



7 { one to the lowest spikelet 8 



( Spikelets very distant, the lower ones each in the axil of a long leafy bract . 12 

 Spikelets ovoid, close together. Fruits tapering to a point, erect or scarcely 



spreading 9 



Spikelets, at least the lower ones, at some distance from each other . . 10 

 Fruits winged at the edges. Stems usually a foot high or more 5. C. leporina. 

 Fruits not winged. Stems usually 8 or 9 inches high . . 6. C. layopina. 

 ( Fruits tapering to a point or beak considerably longer than the glume . . 11 

 lOx Fruits erect, ovate, with a minute point. Stems a foot or more. Spikelets 

 ( pale green 9. C. canetcens. 



(Ripe spikelets nearly globular, with very spreading beaked fruits. Stem 6 or 

 8 inches. . . . . . . . . . . . 8. C. stellulata. 

 Ripe spikelets oblong, with rather spreading pointed fruits. Stem 1 to 2 feet. 

 7. C. elongata. 



( All the spikelets simple, sessile, and distant . . . . 10. C. remota, 

 12 Lower spikelets branched or 2 or 3 together. Upper ones rather near together. 

 I 11. C. ZxUari*. 



., /Stems tufted, without creeping rootstocks 14 



10 \Rootetock long and creeping 18 



( Spike compound or branched. Stems 1 to 4 feet (usually 2 to 3 feet) . . 15 

 14 < Spike simple or the lower spikelets slightly compound. Stems not a foot or 



( very slender 16 



( Spike or panicle dark brown, rather loose. Fruits obtusely 3-angled. 

 Ifi J 12. C. paniculata. 



10 } Spike cylindrical, often green, densely crowded. Fruits much flattened, with 



i. acute angles. Stem acutely triangular 13. C. mUpina. 



( Spikelets near together, in a terminal brown spike about an inch long. 



16 < 14. C. muricata. 



( Lower spikelets distant, all pale brown or green 17 



( Fruiting spikelets globular, no male flowers at their base . . 14. C. muricata. 



17 < Fruiting spikelets oblong, a few males at the base of some of them. Fruits 



( flattened 11. C. axillaris. 



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

 thin or winged edge 15. C. arenaria. 

 Spikelets short, in a spike of about i inch. Fruit very convex, not winged . 19 

 ( Spike ovoid, the spikelets distinct. Stem slender, erect . . 16. C. divixa. 

 19 A Spike nearly globular, very dense. Stem short, curving downwards. 



17. C. ineurva. 



y.( Spikelets short, erect 21 



m \ Spikelets oblong or cylindrical, stalked and drooping 22 



{Spikelets at length rather distant, the lowest scarcely stalked. Fruit ovoid, 

 obtuse 22. C. Bwebaumii. 

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

 21. C. alpina. 



( Spikelets oblong, very black. Fruit triangular, with a short beak 23. C. atrata. 

 22 < Spikelets cylindrical, green. Glumes and fruits with long subulate points. 

 ( 43. C. Pseudocyperut. 



Spikelets several, one or more terminal ones wholly male. 

 23J Stigmas 2 24 



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

 24 ^ 11. C.axiUari*. 



( Spikelets cylindrical or oblong, few, dark-brown or black 25 



, / FruiU very convex or inflated . 18. C. taxatili*. 



M \ FruiU nearly flat 26 



Glumes mostly obtuse. Spikelets I to 2 inches long . . .19. C. 

 Glumes mostly narrow and pointed. Female spikeleta 3 inches or more. 



20 C aeuta 



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

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



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



in the sheaths 24. C. humilit. 



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



25. C diaitata. 



