HOFFMANN: FLORA OF BERKSHIRE COUNTY. 275 



DENTARIA. Peppkr-root. 



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

 Grey lock. 



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. — Roadside escape. Cheshire and 

 Lanesboro (Churchill); Pittsfield (Lincoln). 



LEPIDIUM. Pepperwort; Peppergrass. 



L. apetalum Willd. — (L. densiflonnn 111. Fl. ed. 2.) 



W^illiamstown (Churchill); dry roadside, Great Barrington (Wal- 

 ters). 



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

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

 Knowlton); Great Barrington. 



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

 and waste ground; coiiunon. 



RADICULA. Water Cress. 



R. Ahmohacia (L.) Robinson. Horse Radish. — {Armor acia 

 Armoracin 111. Fl. ed. 2.) 



Frequently escaping from cultivation to waste or low ground. 



R. Nasturtium-aql'aticum (L.) Britten & Rendle. Water 

 Cress. — {Sisymbrium Nasturtium-aqiiaficum 111. Fl. o<l. 2.) 



Brof)ks; frcfjucnt. 



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

 wet meadows and muddy shores; common in llic \;illty. 



var. hispida fDcsv.) Rol)inson. — (/?. hlspidd 111. Fl. ed. 2.) 



Wet places, swales and low meadows; frc(|ueiit in tlie valley. 



R. sYLVESTRis (L.) Druce. ^'KI,I.()W Cress. — Established in wet 

 meadows along the Ilousatonic RImt. ."-Stockbridge; SlicHicld. Also 

 occasional a.s a weed in gar<lens. 



