PI. end. ph. 9. CYPERACE^. 39. Schcenus. 73 



1. Schcenus nigricans. Black hogrush. 

 Head ovate ; spikelets many ; hracteaz unequal, lower 



ending in an awlshape bristle longer than the head ; culm 

 round, smooth. 



Scirpus q. JuDCUS lasvis minor, panicula ^lomerata nigricante, Raii Syn. 

 430, 10. 



JVIelanoscbcenus palustris, Micheli N. P. G. 46. 

 Schcenus nigricans, Lin. S. P. 64. 

 Cyperus nigricans, Witlt. 78. 



Spongy bogs ; perennial ; May and June. 



Culm erect, 18 in. high; head terminal, black, shining; 

 leaves rather rough ; loiver bractece ovate ; stem clasping, 

 black, enclosing the spikelets, cartilaginous, shining, ribbed, 

 opake, ridged, rib green, ending in an awlshape seta longer 

 than the head ; upper Iraclece 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 ferruglneus. Brown logrush. 

 Head linear ; spikelets 2 or 3 ; Iractece nearly equal ; 



bristle scarcely longer than the head; adm round, smooth. 



Schcenus 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; IracteolcB at the base of each spike, 

 ovate, 5-ribbed, back smooth ; hrccctecB nearly equal, setae 

 4- or 5. 



C. SciRPiDE.i3. Glumes imbricate all round; flowers 

 hermaphrodite ; glumelles more or less bristlelike. 



IX. 40. SCIRPUS. Tragus. Rush. 



Spathelles 1, imbricate all round, all fertile; spaihellides 

 bristly, bristles 5 or 6, toothed, shorter than the glumes ; 

 stamens 2 or 3; style 1, not dilated at the bottom, jointed, 

 deciduous ; stigmata 2 ; akenium 3-sided. 



a. Boeotherion. Root Jibroits, perennial; culm round, smooth, 

 striated; leaves none; sheaths tubular, leafless; spikes solitary , 

 terminal; IractecB 2, glumaceous. 



1. Scirpus ccBspitosus. Turf rush. 



Spike ovate, 4 or 5-flowered ; Iractece. nearly equal, as 



long as the spike; lower ending in a very short blunt 



mucro ; radical scales many. 



