HOFFMANN: FLORA OF BERKSHIRE COUNTY. 275 



DENTARIA. Peppee-root. 



D. diphylla Michx. — Rich woods; common. Altitude 2500 feet, 

 Greylock. 



D. laciniata Miihl.— 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. MATKONALis L. RocKET. — Roadside escape. Cheshire and 

 Lanesboro (Churchill); Pittsfield (Lincoln). 



LEPIDIUM. Pbppeewort; Peppergbass. 



L. APETALUM Willd. — (i. densiflorum 111. Fl. ed. 2.) 



Williamstown (Churchill); dry roadside, Great Harrington (Wal- 

 ters) . 



L. CAMPESTEE (L.) R. Br. — Occasional on roadsides. Pittsfield; 

 Stockbridge; moist field. West Stockbridge (Evans, Fernald and 

 Knowlton); Great Barrington. 



L. virginicum L. Wild Peppergkass. — Dry fields, roadsides 

 and waste ground; common. 



RADICTJLA. Water Cress. 



R. Armoeacia (L.) Robinson. Horse Radish. — {Armoracia 

 Armoracia 111. Fl. ed. 2.) 



Frequently escaping from cultivation to waste or low ground. 



R. Nastuetitjm-aquaticum (L.) Britten & Rendle. Water 

 Cress. — ; (Sisymbrium Nasturtium-aquaticum lU. Fl. ed. 2.) 



Brooks; frequent. 



R. palustris (L.) Moench. Marsh Cress. — Roadside ditches, 

 wet meadows and muddy shores; common in the valley. 



var. hispida (Desv.) Robinson. — {R. hispida 111. Fl. ed. 2.) 



Wet places, swales and low meadows; frequent in the valley. 



R. sYLVESTEis (L.) Druce. Yellow Cress. — Established in wet 

 meadows along the Housatonic River. Stockbridge; Sheffield. Also 

 occasional as a weed in gardens. 



