SEDGE FAMILY. 239 
a1. Cyperus acuminatus Torr. & Hook. 
Short-pointed Cyperus. (Fig. 553.) 
Cyperus acuminatus Torr. & Hook. Ann. Lye. N. Y. 3: 
435. 1836. 
Annual, culms very slender, tufted, 3/-15’ tall, 
longer than or equalling the leaves. Leaves light 
green, usually less than 1/’ wide, those of the invo- 
lucre much elongated; umbel 1-4-rayed, simple; rays 
short; spikelets flat, ovate-oblong, obtuse, 2’/-4/’ 
long, many-flowered, densely capitate; scales oblong, 
pale green, 3-nerved, coarsely cellular, conduplicate, 
with a short sharp more or less recurved tip; stamen 
1; style 3-cleft; achene sharply 3-angled, gray, ob- 
long, narrowed at each end, about one-half as long 
as the scale. 
In moist soil, Illinois to Louisiana, west to “Kansas, 
Oregon, Texas and California. July—Oct. 
12. Cyperus faiscus I. Brown Cyperus. (Fig. 554.) 
If® Cyperus fuscus L,. Sp. Pl. 46. 1753. 
AN 
13. Cyperus Haspan IL. Sheathed Cyperus. (Fig. 555.) 
Cyperus Haspan I,. Sp. Pl. 45. 1753. 
Annual, culms slender, tufted, 6/-15’ high, longer 
than or equalled by the leaves. Leaves rather dark 
green, about 1’’ wide, those of the involucre 4-6, 
the longer much exceeding the inflorescence; um- 
bel several-rayed, somewhat compound, the rays 
short; spikelets linear, 2’’-7’’ long, less than 1// 
wide, many-flowered, acute; scales ovate, subacute, 
becoming dark brown or remaining greenish on 
the keel, faintly about 3-nerved on the back, sepa- 
rating from the narrowly winged rachis as they 
mature; stamens 2 or 3; style 3-cleft; achene sharply 
3-angled, oblong, pointed at each end, nearly as 
long as the scale. 
Revere Beach, Mass., and New London, Conn. Ad- 
ventive or fugitive from Europe. Also in ballast about 
the eastern seaports. July-Sept. 
Perennial by short rootstocks (sometimes an- 
nual ?), roots fibrous, culms slender, weak, tufted, 
1°-3° high. Lower leaves reduced to membran- 
ous acuminate sheaths, those of the involucre 
about 2, usually less than 1’’ wide, commonly little 
exceeding or shorter than the inflorescence; umbel 
several-rayed, simple or compound, the longer 
Tays 1/2’ long; spikelets few, capitate, linear, 
acute, many-flowered, 3/’-6’/ long, about 4’ 
wide; scales oblong or oblong-lanceolate, reddish- 
brown, acute, mucronulate, keeled, 3-nerved; 
rachis narrowly winged; stamens 3; style 3-cleft, 
scarcely exserted; achene 3-angled, broadly ob- 
ovoid, obtuse, nearly white, very much shorter 
than the scale. 
In swamps, Virginia to Florida and Texas, mostly 
near the coast. Also in tropical America and in the 
ce parts of Europe, Asia and Australia. July- 
Sept. . 
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