HOFFMANN: FLORA OF BERKSHIRE COUNTY. 275 
DENTARIA. Pepper-root. 
D. diphylla Michx. — Rich woods; common. Altitude 2500 feet, 
Greylock. 
D. laciniata Muhl. — Rich soil in low woods, Sheffield (Walters). 
ERYSIMUM. Treacle Mustard. 
(Cheirinia 111. Fl. ed. 2.) 
E. cheiranthoides L. — Waste ground; frequent. Also occa- 
sional and apparently indigenous on ledges in the valley. 
HESPERIS. Rocket. 
H. MATRONALis L. RocKET. — Roadsidc escape. Cheshire and 
Lanesboro (Churchill); Pittsfield (Lincoln). 
LEPIDIUM. Pepperwort; Peppergrass. 
L. APETALUM Willd. — (L. densiflorinn 111. Fl. ed. 2.) 
Williamstown (Churchill); dry roadside, Great Barrington (Wal- 
ters). 
L. CAMPESTRE (L.) R. Br. — Occasional on roadsides. Pittsfield; 
Stockbridge; moist field. West Stockbridge (Evans, Feinald and 
Knowlton) ; Great Barrington. 
L. virginicum L. Wild Peppergrass. — Dry fields, roadsides 
and waste ground; common. 
RADICULA. Water Cress. 
R. Armoracia (L.) Robinson. Horse Radish. — {Armoracia 
Armor acid 111. Fl. cd. 2.) 
Frequently escaping from cultivation to waste or low ground. 
R. Nasturtium-aquaticum (L.) Britten & Rendle. Water 
Cress. — {Sisymbrium Nasfurtium-aqiiaficum 111. Fl. ed. 2.) 
Brooks; frcf|uent. 
R. palustris (L.) Moench. Marsh Cress. — Roadside ditches, 
wet meadows and nuiddy shores; common in the valley. 
var. hispida (Desv.) R()l)inson. — {R. hispida 111. Fl. cd. 2.) 
Wet places, swales and low meadows; frequent in the valley. 
R. sYLVKSTHis (L.) Dnicc. Yellow Cress. — Established in wet 
meadows along the Ilousatonic River. Stockbridge; Sheflield. Also 
occasional as a weed in gardens. 
