CYPERACE.E. 265 



2. Stamens at the base of the spike. 



Group 8. Spike 1, sometimes more. 



40. C. squarrosa, L. Moist fields ; Hadley. 



B. Terminal spike androgynous, pistillate at the summit ; the 

 others pistillate. 



Group 9. Pistillate spikes 2 or more. 



41. C. virescens, Muhl. Borders of meadows, 

 var. costata, Schw. and Tor. Do. 



42. C. hirsuta, Willd., C. triceps, Mx. Moist meadows, 

 var. pedunculata. Tor. Do. 



43. C. Buxbaumii, Wahl. Do. 



44. C. formosa, D. Do. 



45. C. gracillima, Schw. Do. and dry. 

 — digitalis, Schw. and Tor. " Mon. Cyp." 



46. C. Torreyana, D., is changed to C. Davisii, Tor. Do. 



C. Staminate spike single and distinct from the pistillate. 



Group 10. Pistillate spikes sessile, or with inclosed 

 peduncles. 



47. C. pubescens, Muhl. Meadows and fields. 



48. C. vestita, Willd. Dry fields in Hampshire County. 



49. C. prcecox, Jacq. Salem ; Dr. Pickering. 



50. C. flava, L. Moist meadows. 



51. C. tentaculata, Muhl. A variety was called C. rostrata, 

 Schk., not of Mx. Wet. 



52. C. lupulina, Muhl. Hop Sedge. A large, strong plant, 

 with a culm from 1 to 2 feet high, and with long leaves, es- 

 pecially those that come out under the flower. The barren spike 

 terminates the culm ; the fruit-bearing spikes are long and large, 

 and resemble the h>p in form ; grows in wet places, and around 

 pools of water ; common ; June. 



53. C. folliculata, Schk., is C. intumescens, Rudge. Wet. 



54. C. varia, Muhl., C. Pennsylvanica, Lam. Fields. 

 var. pedicellala, D. In tufts. 



55. C. marginata, Muhl. Open woods. 



56. C. Davisii, D., changed to C. Emmonsii, D. Dry hills. 



34 



