366 North American Cyyeracea. 



Schoenus distans, Muhl. ! gram. p. 10. 

 S. fuscus, Muhl. gram. p. 6. 



B. Nut smooth, inostly lenticular. 



15. R. ALBA, Vahl, emim. 2. p. 236 : ElHoU, sk. 1. p. 

 57 ; Torr. ! fi. 1. p. 54 ; Gray ! Gram. ^ Ct/jj. part 1. no. 92, 

 and monogr. I. c. p. 213. 



Schoenus albus, Linn. 

 This species was collected by Drummond in Texas. 



16. R. CAPiLLACEA, Torr.! fl. 1. p. 55 ; Gray! Gram. 

 ^ ^yP' P^''- ^' "*-•• ^^' ^'^'^ monogr. I. c. p. 214. 



Schoenus setaceus, Muhl. gram. p. 6. 



17. R. FUSCA, Rcem. ^ Schult. sysi. 2. p. 81 ; Gray ! 



monogr. I. c. p. 215. 



R. alba. var. fusca, Vahl, enum. 2. p. 236. 

 Schoenus fuscus, Linn. 



Massachusetts, W.OaJces! ^ndB. D. Greene/ Esqrs. Those 

 European authors who still consider this species as a variety of 

 K. alba, cannot have examined the plant with sufficient care. 

 As regards the English plants, Mr. W. A. Leighton has well 

 indicated their characteristic differences in the London and 

 Edinb. Jour. Science for Dec. 1835. 



18. R. FILIFOLIA. 



Culm very slender ; leaves filiform or capillary ; corymbs 

 very small, rather crowded ; spikelets (minute) ovate-oblong ; 

 nut smooth, ovate-orbicular, lenticular, crowned with a lenticu- 

 lar, much compressed, hispid-scabrous tubercle; bristles an- 

 trorsely scabrous-hispid, as long as the nut and tubercle. 



Culm 6 — 12 inches high, obscurely trigonous. Leaves numerous, 

 shorter than the culra. Corymbs, or fascicles, few-flowered, clustered ; 

 the lateral ones on short exsert peduncles. Scales mucronate, fuscous. 



