418 CXLI. CYPERACER. 
Style equal at base. 
Spikelets many-flowered. 
Perianth of 6 hispid,smooth or pinmos 
Msbes ck ee . 5. Scrrpus. 
Perianth of 3 scales, and mostly 3 in- 
terposed bristles ; outer glumes hairy 6, FUIRENA. 
Spikelets 2-flowered ; ie ana of 6 short, 
pilose bristles . . . . 22. SCLEROCHEZTIUM. 
Perianth 0. 
Style equal at base. 
Spikelets many-flowered. 
Glumes simple, without any inner pales 
or valves. 
No disk surrounding the ovary or 
achene . 7. IsOLEPIS. 
A thickened 2-3-lobed disk under 
the ovary . . 10. FIcrnza. 
Glumes having within them either 
paleze or valves. 
Palez 2, the larger hyaline, clasping 
the flower 
Glumes internally bivalve; the ‘valves 
hyaline, clasping the flower eo tee 
Spikelets few-flowered, minute, crowded 
in a head and mixed with large, imbri- 
cated, membranous bracts .. . . 11. 
Style dilated at base. 
Spikelets many-flowered ; style-base often 
ciliate, deciduous . . 8. 
Spikelets 2—1-flowered ; achene complete- 
ly covered by the cup-like style-base . 16. 
(2) Flowers all unisexual; spikelets either mone- 
cious or androgynous. 
Achenes without any special covering. 
Inflorescence diffuse; achenes stony; culms 
3-angled, leafy . : 
Spike solitary, many- -flowered ; the terminal 
flowers female, the rest male, monandrous, 
with very long linear anthers ; culms flat ; 
leaves equitant. . - 28. 
Male spikes capitate, female asillary fruit 
inflated, with solid beak. . . s fous 
Achenes enclosed in a sac-like envelope. 
No bristle or awn within the sac of the achene. 
Sacs free in the axil of the glume, 2-dentate 29. 
Sacs 3-angled, embracing the rachis of 
spikelets) .  . % 31. 
A hooked awn projecting from the sac of 
achene .. : So '8. ve Leake a BOF 
12. HEMICARPHA. 
PLATYLEPIS. 
MELANCRANIS. 
FIMBRISTYLIS. 
CLADIUM. 
. 27. SCLERIA. 
CHRYSITHRIX. 
AULACORHYNCHUS. 
CAREX. 
ScH@NOXIPHIUM. 
UNCINIA. 
Trrpe 1. Cyprrem. (Gen. 1-3.) 
1. CYPERUS, Linn. 
Spikelets many-flowered. Glumes distichous, all floriferous 
