364 North American Cyperacece. 



styles, and distinct persistent tubercles. They are distinguished 

 from Carjiha, R. Brown, by the distinct tubercle and globose 

 nut. 



1. R. PLUMOSA, Elliott ! sTc. 1. p. 58; Sprejig. syst. 1. p. 

 195; Gray! ?nonogr. I. c. p. 203. 



SchcEnus ciliaris, Mulil. gram, (not oi Michx.) 



2. R. SEMIPLUMOSA, Gray ! monogr. I. c. p. 213. 

 Specimens of this plant collected near New Orleans by Mr. 



Drummond, 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 Bost.jour. nat. hist, ]. p. 140. (not of Vahl.) 



Fine specimens of this interesting species were collected in 

 Texas by the late ]\[r. 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. 



§ 2. Nut lenticular, or more or less compressed ; bristles of the 

 perigy7iium ?iaked, scabrous or denticulate-hispid. — 



True Rhynchospoh^. 



A. Nut rugose. 



4. R. CYMOSA, Nutt. gen. 1. p. 33, (not oi Elliott); Torr.! 

 fl. 1. p. 56, (excl. syn. Elliott ^ Pni'sh) ; Gray! monogr. I.e. 

 p. 196. 



SchcEnus cymosus, Willd. sf. 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.) 



