364 North American Cyperacea. 
styles, and distinct persistent tubercles. They are distinguished 
from Cari^ha, R. Brown, by the distinct tubercle and globose 
nut. 
1. R. PLUMOSA, Elliott! sTi. 1. p. 58; Spreng. syst. 1. p. 
195; Gray.' monogr. I. c. p. 203. 
Schoenus ciliaris, MM. gram, (not o[ Michx.) 
2. R. SEMIPLUMOSA, Gray ! monogr. I. c. p. 213. 
Specimens of this plant collected near New Orleans by Mr. 
Druramond, have recently been received, exactly resembling 
those formerly sent by Dr. Ingalls. They are, however, not 
sufficiently mature to enable us to pronounce with certainty 
that the plant is not a variety of the preceding species. 
3. R. OLiGANTHA, Gray ! monogr. 1. c. p. 212. 
R. triflora, Curtis! in Bosi.jour. nat. hist. 1. p. 140. (not of Vahl.) 
Fine specimens of this interesting species were collected in 
Texas by the late Mr. Drummond (Texas collection I. no. 282.). 
The leaves are mostly radical, almost capillary, and equalling 
or overtopping the filiform culms. The bristles are a little 
shorter than the nut ; but on referring to the description of Mr. 
Curtis, the same is found to be the case in the North Carolina 
plant. The specimens on which the species was originally 
founded were not, perhaps, sufficiently mature. 
<§i 2. Nut lenticular, or more or less compressed ; bristles of the 
perigynium nahed, scabrous or denticulate-hispid. — 
True Rhynchospgh^e. 
A. Nut rugose. 
4. R. CYMOSA, Nutt.gcn. 1. p. 33, (not oi^ Elliott); Torr.! 
fl. 1. p. 56, (excl. syn. Elliott ^' Pursh) ; Gray! monogr. I.e. 
p. 196. 
Schosnus cymosus, Willd. sp. 1. p. 265; Muhl.! gram. p. 9. 
5. R. Torre YANA, Gray! monogr. I. c. p. 197. 
R. micrantha, Gray! Gram. 8f Cyp. part 1. no. 96. (excl. syn.) 
