250 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



P. balsamifera L., var. virginiana Sarg. Cottonwood; Neck- 

 lace PoPLAE. — (P. deltoides Man. ed. 7 and 111. Fl. ed. 2.) 



Along streams in the valley; frequent. 



P. grandidentata Michx. Large-toothed Aspen. — Woods; 

 common. 



P. NIGRA L., var. ITALICA Du Roi. LOMBARDY PoPLAR. — (P. 



italica 111. Fl. ed. 2.) 



Occasionally spreading from cultivated trees. 



P. tacamahacca Mill. Balsam Poplar. — (P. balsamifera Man. 

 ed. 7 and m. Fl. ed. 2; vid. Journ. Arnold Arb., 1: 61, 1919.) 



Spreading freely from planted trees. Indigenous along Cascade 

 Brook, Hoosac Tunnel, Florida. 



var. Michauxiana (Dode) Henry. — River-bank, North Adams 

 (Fernald and Long). 



Differs from the type in the ovate leaves with a broad, rounded or 

 subcordate base, and slight pubescence on the midrib and veins be- 

 neath; petioles and twigs are also slightly hairy. Vid. Garden 

 Chronicle, ser. 3, 59: 230 (1916). 



P. tremuloides Michx. American Aspen. — Dry woods and 

 clearings; common. 



SALIX. Willow. 



S. ALBA L. White Willow. — Along streams; occasional. Deer- 

 field R., Florida; Williamstown; Adams (Churchill); Pittsfield; 

 Great Barrington; Egremont. 



var. vitellina (L.) Koch. — Along rivers and streams; common in 

 the valley, occasional up to an altitude of 1500 feet on the plateau. 



S. Candida Fliigge. Hoary Willow. — Cold bogs; frequent. 



var. denudata Anders. — Occasional. Stockbridge; West Stock- 

 bridge (Evans, Fernald and Knowlton); Egremont. 



S. cordata Muhl. — Low ground, along streams and on the plateau, 

 along roadsides; common. Summit of Greylock, 3500 feet. 



var. myricoides (Muhl.) Carey. — Occasional. October Mt., 

 Washington; Pontoosuc Lake, Lanesboro (Churchill). 



S. discolor Muhl. Glaucous Willow; Pussy Willow. — 

 Swamps and low ground, and on the plateau, along roadsides; com- 

 mon. 



var. eriocephala (Michx.) Anders. — Occasional. Pittsfield. 



var. prinoides (Pursh) Anders. — Great Barrington. 



