366 North American Cyperacea:. 
Schoenus distans, Muhl. ! gram. p. 10. 
S. fuscus, Muhl. gram. p. 6. 
B. Nut smooth, mostly lenticular. 
15. R. ALBA, Vahl, e7ium. 2. p. 236 : Elliott, sk. 1. p. 
57 ; Torr. ! ji. 1. p. 54 ; Gray ! Gram. &f Cyp. 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.! fi. 1. p. bb\ Gray! Gram. 
4' ^yP' P'^^^ -'■• "°' ^'^» ^^^^ monogr. I. c. p. 214. 
Schoenus setaceus, Muhl. grain, p. 6. 
17. R. FuscA, Roem. ^ Scliult. syst. 2. p. 81; Gray! 
monogr. I. c. p. 215. 
R. alba, var. fusca, Vahl, enum. 2. p. 236. 
Schoenus fuscus, Linn. 
Massachusetts, W.OaJces! 2ind B.D. Grcoie ! Y.sqrs. Those 
European authors who still consider this species as a variety of 
jK. 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 culm. Corymbs, or fascicles, few-flowered, clustered ; 
the lateral ones on short exsert peduncles. Scales mucronate, fuscous. 
