Carex.} LXXXVIII. CYPEEACEiE. 489 



fi f Terminal spikelet male at the base. Spike simple 7 



°\ Terminal spikelet male at the top. Spike often branched or compound. . 13 



{Spikelets forming a terminal spike without leafy bracts, or with only a small 

 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 



8 -J spreading 9 



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

 q / 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. lagopina. 

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

 10 -j Fruits erect, ovate, with a minute point. Stems a foot or more. Spikelets 

 ( pale green 9. C. canescens. 



(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, seasile, and distant . . . 10. C. remota. 



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

 ( 11. C. axillaris. 



. Q j Stems tufted, without creeping rootstocks 14 



( Rootstock long and creeping 18 



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

 14 -j 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. 

 |f J 12. C. paniculata. 



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



I. acute angles. Stem acutely triangular 13. C. vulpina. 



L 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. 

 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 

 18-1 thin or winged edge 15. C. arenaria. 



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



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

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



( 17. C. incurva. 

 20 / Spikelets short, erect 21 



\ Spikelets oblong or cylindrical, stalked and drooping 22 



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



21 J obtuse 22. C. Buxbaumii. 



1 1 Spikelets close together, the lowest stalked. Fruit angular, shortly beaked. 



V 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. Pseudocyperus. 



Spikelets several, one or more terminal ones wholly male. 



„o/ Stigmas 2 24 



Zd \Stigmas3 27 



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

 24 ■< 11. C. axillaris. 



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



9f . / Fruits very convex or inflated 18. C. saxatilis. 



zo \ Fruits nearly flat .26 



{Glumes mostly obtuse. Spikelets £ to 2 inches long . . .19. C. ccespitosa. 

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

 20. C. acuta. 

 27 / Bracts sheathing, without leafy tips. (Fruits obtuse, slightly downy) . . 2S 

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

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



go] in the sheaths 24. C. humilis. 



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

 I 25. C digitata. 



