MIDDLESEX FLORA. 119 



C tenella, Schk. 



Billerica (Dr. C. W. Swan) ; Concord (E. S. Hoar, and herb. 



Thoreau). 

 C. rosea, Schk. 



Common. 

 C. rosea, Schk., var. radiata, Dew. (includmg var. minor, Boott, 



Man). Stoneham (F. S. Collins). Probably not uncommon. 

 C. rosea, Schk., var. retroflexa, Torr. (C. retroflexa, Muhl., 



Man.) 



Maiden (H. A. Young) ; Melrose (Rev. Thos. Morong) ; Concord 



(E. S. Hoar) ; Newton (P. S. Collins) ; hills about Spot Pond (Wm. 



Boott). Not common. 



C. MURICATA, L. 

 Somerville (Dr. C. W. Swan) ; Concord (herb. Thoreau) ; Medford 

 (F. S. Collins) ; Ai-lington (Wm. Boott). Nat. from Eu. 



C. sparganioides, Muhl. 

 Melrose (H. A. Young) ; Winchester (C. B. Perkins) ; Concord 

 (E. S. Hoar) ; Maiden (F. S. Collins). Not common. 



C. Wluhlenbergii, Schk. 

 Eather common. 



C. cephalophora, Muhl. 



Not uncommon. 

 C. exilis. Dew. 



Concord (E. S. Hoar) ; Tewksbury (F. Boott ; specimen in herb. 

 B. S. N. H.) ; Lexington (C. E. Faxon) ; et al. Not very common. 

 C. echinata, Murr., var. microstaohys, Boeckl. (including C. 

 sterills, Willd., C. stellulata, L., var. angustata, Carey, and var. 

 scirpoides, Carey, Man.) 



C. canescens, L. 

 Common. 



C. canescens, L., var. polystachya, Boott. 

 Ashland (Eev. Thos. Morong; specimen in herb. of). 



C. canescens, L., var. vulgaris, Bailey, (var. alpicola, Bailey, 

 Synopsis, in part.) 



Cambridge (W. Deane ; specimen in herb. of). 

 " Differs from the species in its more slender culm and laxer habit, 

 its small spikes, and usually smaller and spreading perigynia. 

 Typical C. canescens is a stout plant, with compact spikes, one- 

 fourth or three-eighths inch long. Both the species and this variety 

 are characterized by a silvery color of the spikes." Bailey, Bot. 

 Gaz., Xni., 86. 



C. trisperma. Dew. 

 Not uncommon. 



