1916] Flora of the Boston District,— XXIV 217 



CAKILE. 



C. edentula (Bigel.) Hook. Sandy and gravelly seashores, all 

 along the coast. 



CAMELINA. 



C. microcarpa Andrz. Waste places, occasional. 

 C. sativa (L.) Crantz. Waste places, occasional. 



CAPSELLA. 



C. Btrsa-pastoris (L.) Medic. Gardens and waste places, very 

 common throughout. 



CARDAMINE. 



C. bulbosa (Schreb.) BSP. Swamps and wet woods; frequent 

 near Boston, but not reported from outlying portions of our district. 



C. parviflora L. Ledges and open woods in central third of 

 district. The plant seems to have a marked soil-preference for the 

 diorite hills. 



C. pennsylvanica Muhl. Brooks and wet places, very common 

 throughout. 



C. pratensis L. Wet meadows, casual at Georgetown (Mrs. C. N. 

 S. Horner, no date) ; spreading in a lawn, Woburn (Marion T. Hosmer, 

 May 12, 1912) ; very abundant along Stony Brook in Weston. 



CONRINGIA. 



C. ORIENTALIS (L.) Dumort. Fields and waste places, Westford, 

 Boston, Dedham, Sherborn, Wellesley. 



CORONOPUS. 



C. didymus (L.) Sm. Lawns and waste places, Boston, S. Boston, 

 Cambridge, Wellesley. 



DENTARIA. 



D. diphylla Michx. Rich moist woods; Cambridge, Concord (in- 

 troduced), Lowell, Norwood (introduced); Arlington (/•>. Tuckerman), 



