SEDGE FAMILY. 



ii. 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 / -i5 / tall, 

 longer than or equalling the leaves. Leaves light 

 green, usually less than i" wide, those of the invo- 

 lucre much elongated; umbel i-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 

 j; 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. 



239 



12. Cyperus fuscus I,. Brown Cyperus. (Fig. 554.) 



13. 



Cyperus Haspan L,. 

 n L. Sp. PI. 45. 1753. 

 Perennial by short rootstocks (sometimes an- 

 nual ?), roots fibrous, culms slender, weak, tufted, 

 i-3 high. Lower leaves reduced to membran- 

 ous acuminate sheaths, those of the involucre 

 about 2, usually less than i" wide, commonly little 

 exceeding or shorter than the inflorescence; umbel 

 several-rayed, simple or compound, the longer 

 rays i / -2 / long; spikelets few, capitate, linear, 

 acute, many-flowered, 3 // -6 // long, about #" 

 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 

 thati the scale. 



In swamps, Virginia to Florida and Texas, mostly 

 near the coast. Also in tropical America and in the 

 warmer parts of Europe, Asia and Australia. July- 

 Sept. 



16 



Cyperus fuscus L. Sp. PI. 46. 1733. 



Annual, culms slender, tufted, V-\*f high, longer 

 than or equalled by the leaves. Leaves rather dark 

 green, about i" wide, those of the involucre 4-6. 

 the longer much exceeding the inflorescence; um- 

 bel several-rayed, somewhat compound, the ray* 

 short; spikelets linear, 2"-7" long, less Uw: 

 wide, many-flowered, acute; scales ovate, snbacnte. 

 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; acbene sharply 

 3-angled, oblong, pointed at each end, nearly as 

 long as the scale. 



Revere Beach, Mass., and New 1.4>tul<>n. Conn 

 ventive or fugitive from Kurope. Also in halls*! I 

 the eastern seaports. July-Sept 



Sheathed Cyperus. (Fig. 555.) 



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