33 6 



CYPERACEAE. 



Vol. I. 



27. Scirpus polyphyllus Vahl. Leafy Bulrush. Fig. 827. 



Scirpus polyphyllus Vahl, Enum. 2 : 274. 1806. 



Perennial by slender rootstocks; culms slender, 

 sharply triangular, ii°-4° tall, very leafy, the leaves 

 2" -3" wide, exactly 3-ranked, inconspicuously nodu- 

 lose, rough-margined, the upper rarely overtopping 

 the culm ; leaves of the involucre 3-6, the longer 

 commonly somewhat exceeding the inflorescence ; 

 umbel more or less compound; spikelets ovoid, 1 J"— 3" 

 long, rarely oblong and 4" long, capitate in 3's-io's 

 at the ends of the raylets ; scales ovate, bright brown, 

 mostly obtuse, mucronulate ; bristles 6, mostly flexu- 

 ous or twice bent, downwardly barbed above the 

 middle, twice as long as the achene ; stamens 3 ; style 

 3-cleft; achene obovoid, 3-angled with a broad face 

 and narrower sides, short-pointed, dull. 



In swamps, wet woods and meadows, Massachusetts to 

 Minnesota, south to Georgia, Tennessee and Arkansas. 

 Some of the scales of the spikelets occasionally develop 

 into linear leaves. July-Sept. 



28. Scirpus Peckii Britton. 

 Fig. 828. 



Peck's Bulrush. 



S. Peckii Britton, Trans. N. Y. Acad. Sci. n : 82. 1892. 



Perennial by rootstocks; culms slender, triangular, 

 li"-4i° tall, leafy. Leaves elongated, 2"-$" wide, rough- 

 margined, the upper overtopping the culm, those of the 

 involucre 3-5, dark-colored at the base, the longer of 

 them exceeding the inflorescence ; umbel 1-2-compound, 

 large; spikelets cylindric, obtusish, 3"-$" long, in capi- 

 tate clusters of 2-10 at the ends of the raylets or some 

 of them distinctly peduncled ; scales dark brown, keeled, 

 mucronate, falling early ; bristles 4-6, downwardly barbed 

 from below the middle to the summit, longer than the 

 achene; style 3-cleft; achene 3-angled, i" long, oblong, 

 narrowed at each end, slender-beaked. 



In swamps, New Hampshire to Connecticut and New 

 York. July-Sept. 



2g. Scirpus divaricatus Ell. Spreading Bulrush. Fig. 829. 



5. divaricatus Ell. Bot. S. C. & Ga. i : 88. pi. 2. f. 4. 1816. 



Perennial. Roots fibrous, culms obtusely trian- 

 gular, smooth, rather slender, 2i°-4° tall. Leaves 

 2"-4" wide, rough-margined, the upper and those of 

 the involucre not exceeding the inflorescence; umbel 

 decompound, the primary rays very slender, some- 

 times 6' long, widely spreading or drooping; raylets 

 filiform; involucels setaceous; spikelets mostly soli- 

 tary at the ends of the raylets, sessile or peduncled, 

 linear-oblong, obtuse, 3" -6" long, 4" thick; scales 

 ovate, greenish-brown, subacute or obtuse, with a 

 prominent midvein and scarious margins; bristles 6, 

 flexuous, longer than the achene, somewhat pubescent, 

 not barbed, shorter than the scales; stamens 3; style 

 3-cleft; achene sharply 3-angled, oblong, narrowed at 

 both ends, apiculate, nearly white, not shining. 



In swamps, Virginia to Kentucky, Missouri, Florida and 

 Louisiana. The spikelets sometimes partially develop into 

 tufts of leaves. June-Aug. 



