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CYPERUS CYPERACE 2 687 
2 Dulichium Inflorescence axillary: perianth of 6-9 bristles: style 
persistent. ; 
+ + Spikelets many-flowered, not flattened, the scales imbricated 
allaround. | 
++ Styles not enlarged at bace.. 
8 Scirpus Spikelets solitary or clustered, or in a compound umbel, 
inyolucrate: perianth of few barbed persistent bristles or wanting. 
4 Eriophorum Spikelets solitary or few, involucrate: perianth of numer- 
ous long silky naked bristles: stamens 1-3. 
5 Hemicarpha Low annuals: spikelets solitary or few, in a sessile 
apparently lateral cluster: perianth a minute hyaline bractlet between 
each flower and the rachis: stamen only one. 
++ ++ Style enlarged at base. 
6 Eleocharis Spikelet solitary and terminal upon a leafless terete stem: 
perianth of 3-9 retrorsely barbed bristles, or wanting: stamens 3: 
base of the style persistent. 
7 Stenophyllus Low annuals, the stem leafy at base; spikelets in an | 
involucrate umbel: perianth none: stamens 1-3. 
* * Spikelets polygamous, few-flowered, ovoid, the scales imbricated 
all around, only the terminal one fertile. 
8 Rhynchospora Stems leafy: spikelets variously clustered: Dea Ny 
of 9-12 retrorsely barbed bristles: achenes lenticular, beaked by the _ 
persistent base of the style. 
* * * Flowers monecious, in the same or distinct spikelets, or 
dicecions: pistillate flowers enclosed in an inflated sac-like persistent 
perigynium. . 
9 Carex Spikelets solitary, spicate or panicled: perianth wholly want- | 
ing, or of a single short bristle at the base of the ovary. 
1 CYPERUS L. Sp. 44. 
Perennial or annual herbs with mostly triangular nearly naked - 
simple stems, alternate nearly radical leaves and perfect flowers 
in few- to many-flowered mostly flattened spikelets, the concave 
more or less carinate scales in 2 ranks. Perianth wholly wanting. 
Stamens 1-3. Style not thickened at base, 2-3-cleft, deciduous. 
Achenes lenticular or 3-angled, not beaked, smooth or nearly so. | 
©. inflexus Muhl. Gram. 16. C. aristatus Beckl. in part. Annual: 
stems slender or almost filiform, diffusely branched from the base, 1-6 inches 
high; leaves a line wide or less, about equalling the stem: those of the involu- 
lucre 2-3, exceeding the inflorescence: umbel sessile, 1-3-rayed: spikelets 
linear-oblong, 6-10-flowered, 2-3 lines long: scales bright brown, lanceolate, 
rather firm, strongly several-nerved,' tapering into a long recurved awn, fall- 
ing from the rachis at maturity: stamens 1: style 3-cleft: rachis narrowly 
winged, the wings persistent: achenes 3-angled, dull brown, narrowly obovoid 
or oblong. obtuse, mucronulate. In wet sandy soil, California to British 
Columbia and the Eastern States. 
C. acuminatus Torr. & Hook. Ann. Lyc,'N. Y. iii, 435. Annual: 
stems very slender, tufted, 2-15 inches ‘high: leaves light green, usually less 
than a line wide, often equalling the stem, those of the involucre much 
elongated: umbel 1-4-rayed, simple, rays short: spikelets flat, ovate oblong, 
