400 CYPERACE^:. 



3, rarely 2, 6 or 12. Style 2-cleft. Achenium crustaceous, 

 crowned with the persistent base of the style. 



* Achenium smooth, mostly lenticular. 



1. R. alba Vahl : culm triangular above ; spikelets in corymbose fascicles ; 

 bristles usually 10, retrorsely hispid, longer than the ovoid-lenticular ache- 

 nium. Schosnus aUnis Linn. 



Swamps and bogs. Can. to Car. W. to Ohio. July, Aug. %. Culm 1218 

 inches high, smooth. Leaves setaceous, shorter than the culm. Spikelets about 

 2-flowered. Scales lanceolate, whitish, when old brownish. 



White Beak Rush. 



2. JR. gracilenta Gray : culm and leaves very slender ; clusters of spike- 

 lets 2 4, small, somewhat crowded, the terminal one nearly sessile ; bristles 

 6, longer than the smooth ovoid-lenticular achenium ; tubercle long, sub- 

 ulate. 



Sandy grounds. N. Y. and N. J. to N. Car. Culm 12 feet high, almost 

 capillary. Leaves linear, setaceous. Spikelets few-flowered, ovoid. Scales 

 ovate, fuscous. Tall Slender Beak Rush. 



3. R. Kneiskernii Carey : culm triangular, slender; spikes numerous, in 

 4 6 distant clusters ; bristles 5, retrorsely hispid, about as long as the obo- 

 vate somewhat stiped achenium; tubercle triangular, compressed, broad 

 at the base. (Carey, Sill. Jour. July, 1847.) 



Pine Barrens, N. J. Dr. Kneiskem. Culm 12 18 inches high, branching 

 from the base. Leaves short and narrow. Spikes small, setaceously bracteate, 

 forming small distant clusters throughout the whole length of the culm. It re- 

 sembles the preceding, but differs in its achenium and bristles. 



Kneiskern's Beak Rush. 



4. JR. glomerata Vahl : culm obtusely triangular ; spikelets ovoid-oblong, 

 in corymbose clusters, distant, mostly in pairs ; bristles 6, hispid, as long 

 as the obovoid-lenticular achenium; tubercle lanceolate. Schcenus glom- 

 eratus Linn. 



Swamps and bogs. Can. to Flor. July, Aug. 1J-. Culm 12 18 inches 

 high, smooth. Leaves flat, shorter than the culm. Scales lanceolate, brownish. 



Clustered Beak Rush. 



5. R. : capillacea Torr.: culm, triangular, slender; spikelets 3 6, nearly 

 terminal ; bristles 6, about twice as long as the oblong-ovate compressed 

 achenium ; 'tubercle lanceolate, rostrate. Schcenus setaceus Muhl. 



Swamps. Can. to Penn. July. f l\. Culm 6 12 inches high. Leaves seta- 

 ceous ; radical ones short. Spikelets aboilt 1 3-flowered. Scales light brown, 

 oblong, mucronate. Capillary Beak Rush. 



6. JR. fusca R. <f- S. : culm obscurely triangular ; clusters of spikelets 1 3 } 

 somewhat capitate; bristles 6, slender, minutely hispid, about twice the 

 length of the obovate achenium ; tubercles slender, acute. Schcenus fuscus 

 Linn. 



Swamps. Mass. N. Y. and N. J. July, Aug. 7J.. CulmS 12 inches high, 

 very slender. Leaver L-liaost filiform ; radical ones elongated. Scales dark- 

 brown and shining. Brown Beak Rush. 



7. /?. cephalantha Gray : heads somewhat globose, dense, many-flowered, 



