368 North American Cyperaeece, 



22. R. CEPHALANTHA, Gray! monogr. I. c. p. 218. 



23. R. PAA'icuLATA, Gray! monogr. I. c. p. 213. 



24. R. FASCicuLARis, Nutt. geii. 1. p. 23; Vahl, enum. 

 2. p. 224 ? ; Gray ! monogr. I. c. p. 210. 



R. cymosa, Ell. sk. 1. p. 58? 



Schojnus fascicularis, Michx. ! fi. 1. ]}. 37. 



25. R. Baldavinii, Gray! monogr. I. c. p. 210. 



26. R. ciLiATA, Ffl7«Z, enum. p. 238; Gray! monogr. I.e. 

 p. 209. 



Schoenus ciliaris, Michx. ! fl. 1. p. 36. 



27. R. MEGALOCARPA. 



Corymbs (3 — 6) kw and loosely flowered ; spikelets large, 

 ovate, turgid; nut smooth, somewhat tumid, flattened toward 

 the base, broad and thickened at the summit, crowned with a 

 very broad, short and conical tubercle; stamens usually 12 ; 

 bristles 6 — 10, nearly as long as the nut. 



R. megalocarpa, GraTj ! monogr. I. c. p. 20S, and R. pycnocarpa, 

 Gray, I. c. 



More perfect specimens, communicated by Mr. Curtis and 

 Dr. Chapman, have enabled us satisfactorily to ascertain that 

 It. megalocarpa and R. pycnocarpa of the Monogi-aph of North 

 American Rhynchos'po7-ce. are different states of the same spe- 

 cies. The nut becomes dark-coloured with age, when the 

 tubercle appears to be confluent with the body of the nut. It 

 approaches R. dodecandra, with which it also agrees in the pre- 

 valent number of its stamens. This species has a somewhat 

 extensive range, being found from Wilmington in N. Carolina 

 to Apalachicola. 



28. R. DODECANDRA, Bttldiv. ! Mss. ^hcrh ; Gray ! monogr. 

 I. c. p. 207. 



The mature fruit of this rare and interesting species has not 

 yet come under our notice. The number of its stamens is very 



