368 North Americaji Cyperacece, 
22. R. CEPHALAXTHA, GrcHj ! monogr. I. c. p. 218, 
23. R. PAXicuLATA, Gray! monogr. I. c. p. 211. 
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? 
SchcEnus fascicularis, Miclix. ! fl. 1. p. 37. 
25. R. Baldwixii, Gray! mojiogr. l. c. p. 210. 
26. R. ciliata, Valil^ enum. p. 238; Gray! monogr. I. c, 
p. 209. 
Schoenus ciliaris, Michx. ! fl. 1. p. 36. 
27. R. megalocarpa. 
Corymbs (3 — 6) few 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 1 2 ; 
bristles 6 — 10, nearly as long as the nut. 
R. megalocarpa, Gray ! monogr. I. c. p. 208, and R. pj'cnocarpa, 
Gray, I. c. 
More perfect specimens, communicated by Mr. Curtis and 
Dr. Chapman, have enabled us satisfactorily to ascertain that 
R. megalocarpa and R. pycnocarpa of the Monograph of North 
American Rhyncliosporcs 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. dodccandra, with which it also agrees in the pi'e- 
valent number of its stamens. This species has a somewhat 
extensive range, being found from Wilmington in N. Carolina 
to Apalachicola. 
28. R. DODEC andra, Baldio. ! Mss. Sfherh ; Gray ! mo?iogr. 
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 
