274 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
B. CAMPESTRis L. Rutabaga. — An occasional escape. Dump, 
Lee; Sheffield (Walters). 
B. JAPONICA Siebold. — Rarely adventive. 
B. JiiNCEA (L.) Cosson. — Roadsides and waste ground; frequent. 
B. NIGRA (L.) Koch. Black Mustard. — Roadsides and waste 
ground; occasional. Lanesboro; New Marlboro; Sheffield. 
B. Napus L. Rape. — Fallow field, Williamstown. 
B. OLERACEA L. Cabbage. — Dump, Lee. 
B. Rapa L. Turnip. — Cultivated ground, Lanesboro (Churchill). 
CAMELINA. 
C. microcarpa Andrz. — Rarely adventive. In field of buckwheat, 
Lenox. 
CAPSELLA. Shepherd's Purse. 
{Bursa 111. Fl. ed. 2.) 
C. Bursa-pastoris (L.) Medic. Shepherd's Purse. — Dry fields 
and cultivated ground; common. 
CARDAMINE. Bitter Cress. 
C. bulbosa (Schreb.) BSP. — Wet shaded ground; frequent in the 
southern part of the valley. Stockbridge; Great Barringtcm (Wal- 
ters); Sheffield (Fernald). 
C. Douglassii (Torr.) Britton. — Partly shaded bank, Sheffield 
(Walters). 
C. parviflora L. — Shaded rocks, Harvey Mt., West Stockbridge. 
C. pennsylvanica Muhl. — Moist ground; common. 
C. pratensis L. Cuckoo Flower. — In lawns. Williamstown; 
Dalton; Stockbridge. 
var. palustris Wimm. & Grab.— ( Vid. Rhodora, 22: 14, 1920.) 
Occasional and indigenous in cold bogs and wet meadows in the 
valley. Stockbridge; West Stockbridge (Evans, Fernald and Knowl- 
ton); Egremont and Sheffield (Walters). 
Differs from the type in the white petals and in having the terminal 
leaflet of the basal leaves entire or obscurely toothed; lateral leaflets 
of the middle and upper cauline leaves usually with a distinct petiolule. 
