392 CYPERACEJS. 



or hispid. Style 2 3 -cleft, bulbous at the base. Achenium 

 lenticular or obtusely triangular. 



* Spike cylindric. Scales rigid, spirally arranged. Style 3-cleft. 



1. E. equisetoides Torr. : culm terete, remotely nodose, papillose; scales 

 suborbicular-ovate, very obtuse or slightly pointed ; bristles 6, as long as 

 the obovate biconvex achenium ; tubercle conic-rostrate, acute. Scirpus 

 equisetoides Ell. 



Bogs and in water. Near Lewiston, Del. S. to Geor. July. %. Culm 

 18 24 inches high, slightly roughened with minute papillae. Spike about an 

 inch long, rather acute. Scales with a narrow scarious margin. 



Equisetum-like Spike Rush. 



2. E. quadrangulala Brown : culm acutely and unequally quadrangular, 

 three of the sides concave, the other wider and flat ; scales broad-ovate, 

 very obtuse ; bristles 6, as long as the obovate striate achenium ; tubercle 

 conic, compressed. Scirpus quadrangulatus Mich. 



Swamps and margins of rivers. Penn. to Car. and Louis. June. r A- 

 Rhizoma creeping. Culm 2 4 feet high, with purple sheaths at base. Spike 

 12 16 lines in length. Scales with a scarious margin, doited with purple. 



Square-stalked Spike Rush. 



** Spike ovoid or oblong. Scales membranaceous, very numerous, irregularly 

 imbricated. Style mostly deleft. 



3. E. palustris Brown : culm terete, striate, spongy ; spike oblong-lance- 

 olate ; scales somewhat obtuse, the two lowest large and empty ; bristles 

 3 6, hispid, longer than the lenticular smooth achenium. Scirpus palus- 

 tris Linn. 



Marshes and low meadows. Arct. Amer. to Flor. W. to the Pacific Ocean. 

 July, Aug. r l\.. Rhizoma creeping. Culm 1 2 feet high, erect, with three 

 sheaths at base. Spike 3 5 lines long, many-flowered. Scales fuscous in the 

 middle. Common Spike Rush. 



4. E. olivacea Torr. : culm filiform, compressed, sulcate, soft ; spike 

 ovoid, mostly somewhat obtuse, many-flowered ; scales ovate, obtuse, mem- 

 branaceous ; bristles 6 8, retrorsely hispid, nearly twice as long as the 

 obovoid lenticular achenium. Scirpus intermedius Gray. 



Wei sandy places. Mass. N. Y. and N. J. Aug. 1\.. Culms 68 inches 

 long, cespitose, erect or decumbent, often dwarfish and slender. Spikes 3 lines 

 long, 20 30-liowered. Achenium smooth, dark olive when ripe. 



Olive-fruited Spike Rush. 



5. E. rostellata Torr. : culm compressed, sulcate ; spike ovoid-lanceolate, 

 acute; scales ovate, obtuse, loose, with a scarious margin ; bristles 4 6, 

 longer than the biconvex shining achenium ; tubercle conic-rostrate. ( Torr. 

 N. Y. Fl.} Scirpus rostellatus Torr. Cyp. 



Penn-Yan, Yates County, N. Y. Torr. T^.Culm 1218 inches high, 

 firm and tough, compressed, sulcate. Spike 12 15-flowered. Scales light brown. 

 Bristles hispid downward. Beaked Spike Rush. 



6. E. intermedia Schultes : culm setaceous, diffuse, compressed, angulai 

 and sulcate ; spike ovoid-lanceolate, acute ; scales somewhat acute ; bris- 

 tles 6, longer than the obovoid compressed achenium ; style 3-cleft ; tubercle 

 distinct. Sci?~pus interinedius Muhl. 



