Carex. | ~ LRRRVIIL CYPBRACEZA, 489 
6 Terminal spikelet male at the base. Spike simple . hve 
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 
7 one to the lowest spikelet . : 
Spikelets very distant, the lower ones each in the axil of a long leafy pract . 12 
Spikelets ovoid, close together. Fruits tapering to a point, erect or scarcely 
sf spreading 3 ; 
Spikelets, at least the lower ones, ‘at some distance from each other ; 10 
9 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 . ay eT 
10} Fruit erect, ovate, with a minute point. Stems a foot or gst Spikelets 
pale green . . C. canescens. 
Ripe spikelets nearly ¢ globular, with very spr eading beaked faxes Stem 6 or 
rl 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. 
124 Lower spikelets branched or 2 or 3 together. Upper ones rather near together. 
11. C. awillaris. 
13 { Stems tufted, without creeping rootstocks . é : ; ; ; , . 14 
Rootstock long and creeping . : . 18 
Spike compound or branched. Stems 1 to 4 feet (usually 2 to 3 feet) . 15 
| Shik simple or the lower spikelets slightly compound. Stems not a foot or 
very slender . : : : A : : 
Spike or panicle dark brown, rather loose. Fruits obtusely 3-angled. 
1b 12. C. paniculata. 
Spike cylindrical, often green, densely crowded. Fruits much flattened, with 
acute angles. ‘Stem acutely triangular. + LAS: "vulpina. 
Spikelets near together, in a terminal brown spike about an inch long. 
16} 14, C. muricata. 
Lower spikelets distant, all pale brown or green. ‘ , é : e's ( 
Fruiting spikelets globular, no male flowers at their base . . 14. C. muricata. 
17 | Biuiing spikelets oblong, a few males at the base of some of them. Fruits 
flattened ; . Ll. C. awvillaris. 
§ Spikelets rather large, ovoid, ina spike of ‘Lor2inches. Fruits with a very 
18 thin or winged edge. . 15. C. arenaria. 
Spikelets short, in a spike of about 2 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. ineurva. 
20 Spikelets short, erect . ‘ ‘ ‘ . eae 
| Spikelets oblong or cylindrical, stalked and ‘dr coping 3 22 
Spikelets at length rather distant, the lowest scarcely stalked. F ruit ovoid, 
21 obtuse . L 22. 0, Buxbaumii. 
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. i a cylindrical, green. Glumes and ‘fruits with long subulate points. 
43. C. Pseudocyperus. 
Spikelets several, one or more terminal ones wholly male, 
93 { Stigmas 2. ‘ : : : ‘ ; , : i p : : : ey: 
Stigmas ee ; ft Sol 
Spikelets small, green, and distant, lower one branched or clustered. 
zt 11. C. axillaris. 
Spikelets cylindrical or oblong, few, dark-brown or black. ; 25 
25 { Fruits very convex or inflated : : ‘ . 18. C. saaatilis. 
Fruits nearly flat . : ‘ ‘ ‘ : . 26 
Glumes mostly obtuse. Spikelets 2 to 2 inches long : ; . 19. C. cespitosa. 
264 Glumes mostly narrow and pointed. Female spikelets 3 inches or Hore 
20. C. acuta. 
97 Peto 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. humilis. 
tems oo than the leaves. Female spikelets near the top, pagar spreading. 
. C. digitata. 
285 
