344 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



H. canadense Michx. — Borders of woods and rocky shores; com- 

 mon. 



H. FLOEENTINUM All. KiiNG Devil. — Adventive, Egremont (Wal- 

 ters) . 



H. paniculatum L. — Dry open woods ; common in the southern 

 part of the valley. 



var. glandulosum Hoffmann. — (Vid. Rhodora, 19: 37, 1917.) 

 Dry woods; occasional. Sandisfield; Stockbridge; Great Barring- 

 ton. A variety based on the presence of stipitate glands on the 

 branches of the inflorescence. 



H. PiLOSELLA L. Mouse-ear. — Established in lawn, Williams- 

 town. 



H. praealtum Gochnat, var. decipiens Koch. — Sandy ground, 

 Sheffield (Churchill). 



H. pratense Tausch. King Devil. — Occasionally adventive in 

 fields, but not yet well established anywhere. West Stockbridge; 

 New Marlboro; Great Barrington (Walters); Sheffield. Frequent 

 in Sheffield (Churchill, 1919). 



H. scabrum Michx. — Dry woods; common. 



H. venosum L. Rattlesnake-weed. — Dry woods; common in 

 the southern part of the valley. 



HYPOCHAERIS. Cats-ear. 



H. RADICATA L. — Adventive in newly seeded grassland, Sandisfield 

 (Walters). 



INULA. Elecampane. 



I. Helenium L. Elecampane. — Roadsides and pastures in low 

 ground, borders of swamps; frequent. 



KRIGIA. Dwarf Dandelion. 



K. virginica (L.) Willd. — Dry open soil, in sterile fields or on out- 

 crops; frequent in the southern part of the valley. 



LACTUCA. Lettuce. 

 Key to Lactuca canadensis and varieties. 

 Vid. Rhodora, 22 : 9, 1920. 

 a. Leaves with linear-falcate, usvially entire lobes; upper unlobed leaves (if 

 any) linear or linear-lanceolate. 

 h. Leaf -base sagittate or auriculate var. typica. 



