9. CYPERACEiE. 39. Schcenus. 7$ 
PI. end. ph. 
1. Schcenus nigricans. Black logrush. 
Head ovate ; spikelels many ; lractece unequal, lower 
ending in an awlshape bristle longer than the head ; culm 
round, smooth. 
Scirpus q. Juncus laevis minor, panicula glomerata nigricante, Rail Syn. 
430, 10. 
Melanoschcenus palustris, Micheli N. P. G. 46. 
Schcenus nigricans, Lin. S. P. 64. 
Cyperus nigricans, With. 78. 
Spongy bogs; perennial; May and June. 
Culm erect, 18 in. high; head terminal, black, shining; 
leaves rather rough ; lower lractece ovate ; stem clasping, 
black, enclosing the spikelets, cartilaginous, shining, ribbed, 
opake, ridged, rib green, ending in an awlshape seta longer 
than the head ; upper lractece small, similar to the lower, 
but the seta is very short, or even wanting; spikelets 
crowded, acute; glumes acute, keel rough; seed shining, 
white. 
2. Schcenus ferrugineus. Brown logrush. 
Head linear; spikelets 2 or 3; lractece nearly equal; 
Iristle scarcely longer than the head; culm round, smooth. 
Scheenus ferrugineus, Lin. S. P. 64. 
Mountain bogs ; perennial ; August. 
Leaves slender, setaceous, very short, smooth; sheath 
brown, apex notched ; culm slender, 8 in. high ; head 
brownish, slender; Iracteolce at the base of each spike, 
ovate, 5-ribbed, back smooth ; lractece nearly equal, setae 
4 or 5. 
C. SciRPiDEiE. Glumes imbricate all round ; flowers 
hermaphrodite ; glumelles more or less bristlelike. 
IX. 40. SCIRPUS. Tragus. Rush. 
Spathelles 1, imbricate all round, all fertile; spaihellules 
bristly, bristles 5 or 6, toothed, shorter than the glumes ; 
stamens 2 br 3; style 1, not dilated at the bottom, jointed, 
deciduous ; stigmata 2 ; akenium 3-sided. 
a. Bceotherion. Root fibrous, perennial; culm round , smooth , 
striated ; leaves none ; sheaths tubular , leafless; spikes solitary , 
terminal; lractece 2, glumaceous. 
1. Scirpus ccespitosus. Turf rush. 
Spike ovate, 4 or 5-flowered ; lractece nearly equal, as 
long as the spike; lower ending in a very short blunt 
mucro; radical scales many. 
