HOFFMANN: FLORA OF BERKSHIRE COUNTY. 335 



AMBROSIA. Ragweed. 



A. artemisiifolia L. Ragweed; Roman Woemwood. — {A. ela- 

 tior 111. Fl. ed. 2.) 



Roadsides, waste places and cultivated ground; common. 



A. TEiFiDA L. — Occasionally adventive. Flood-plain of the Hoosac 

 River, Williamstown; chicken-yard, Stockbridge. 



ANAPHALIS. Everlasting. 



A. margaritacea (L.) B. & H. Pearly Everlasting. — Dry open 

 woods, upland pastures and clearings; common. 



ANTENNARIA. Everlasting; Ladies' Tobacco. 



A. Brainerdii Femald. — Bank of Deerfield River, Florida. 



A. canadensis Greene. — Wooded banks; frequent. 



A form with purplish stem, with petaloid bracts, from Savoy. 



A. f allax Greene. — Rich open woods ; frequent in the valley. 



A. neglecta Greene. — Fields and open woods; common, especially 

 on the plateau. Altitude 2300 ft., Florida. Plants collected from 

 Great Barrington approach var. simplex Peck. 



A. neodioica Greene. — Open woods, often on thin soU over rocks; 

 common. 



var. grandis Fernald. — Open woods; frequent. 



A. occidentalis Greene. — Rich open woods and grassy banks; fre- 

 quent. 



A. Parlinii Fernald. — Rich open woods and grassy banks; fre- 

 quent in the valley. 



A. petaloidea Fernald. — Rocky woods; frequent in the valley. 



A. plantaginifolia (L.) Richards. — Dry woods; frequent in the 

 southern part of the valley. Occasional as far north as Cheshire 

 (Cushman). 



ANTHEMIS. Chamomile. 



A. CoTULA L. May-weed. — Roadsides and waste places; com- 

 mon. 



ARCTIUM. Burdock. 

 Key to Arctium, 

 a. Heads corymbose, long-peduncled; leaf-blades round-ovate, , obtuse; 

 petioles strongly angular, deeply furrowed. 

 Petioles solid; heads very large and broad, 3 to 4.5 cm. in diameter; 

 involucre glabrous, green A. Lappa. 



