344 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
H. canadense Michx. — Borders of woods and rocky shores; com- 
mon. 
H. FLORKNTINUM All. KiNG Devil. — Adventive, Egremont (Wal- 
ters). 
H. paniculatum I>. — Dry open woods; common in the southern 
part of the valley. 
var. glandulosum Hoffmann. — {Vid. Rhodora, 19: 37, 1917.) 
Dry woods; occasional. Sandisfield; Stockl)ridge; 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 Sheflield (Churchill, 1919). 
H. scabrum Michx. — Dry woods; common. 
H. venosum L. Rattlesnake-weed. — Dry woods; common in 
the southern part of the valley. 
HYPOCHAERIS. Cat's-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. 
Fid. Rhodora, 22: 9, 1920. 
a. Leaves with linear-falcate, usually entire lobes; upper unlobed leaves (if 
any) linear or linear-lanceolate. 
b. Leaf-base sagittate or auriculate var. typica. 
