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, i2-4 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, i"-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. 



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



Perennial by rootstocks ; culms slender, triangular, 

 ii-4^ 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 i-2-compound, 

 large ; spikelets cylindric, obtusish, 3" -5" 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. 



Scirpus divaricatus Ell. Spreading Bulrush. Fig. 829. 



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



Perennial. Roots fibrous, culms obtusely trian- 

 gular, smooth, rather slender, 2^-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, \" thick; scales 

 ovate, greenish-brown, subac'ute 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. 



