99 



Georgetown, as this species, are but small spedmens of B. nigra. 

 Not represented in the county herbarium. Very doubtful as a native 

 of this region. 



Aluus incana, Willd. (Specbxbd or Hoary Albbk.) 



Frequent in wet places. 

 Alnus serrulata, Ait. (Common Alder.) 



By streams and moist roadsides. Abundant. 



SAIiICAC£.S:. 

 (Willow Family.) 



Salix Candida, Willd. (Hoary Willow.) 

 A meadow in Boxford, the first locality reported in this region, 

 plants of both sexes being quite numerous. First noticed Aug. 

 1875 (J. E.). 



Salix tristis, Ait. (Dwarf Gray Willow.) 

 Lynnfleld, Danvers (J. H. Sears), etc. In places occupied by the 

 Bear Oais. Not very common. 



Var. mierophylla. (Gray's Manual.) 

 Essex County (Oakes). 



Salix humilis, Marshall. (Pbairik Willow.) 

 Dry places. Rather common. Many of the willows have cones, 

 persistent after the leaves fall, upon the ends of the branches. 

 They are caused by the sting of an insect; and, if cut into when 

 green, the larva of the fly will be found within. 



Salix discolor, JlfuW. (Pussywillow). 

 Common in damp places. 



Salix sericea, Marshall. (Silky Willow.) 

 Along streams. Not very common. 



Salix petiolaris, Smith. 

 Middleton, Andover, Methuen, Chebacco, etc. Frequent. 



Salix pixrpurea, Z. 

 Swanipseott, Salem, Newburyport. Introduced for basket work. 

 (Adv. from Eu.) 



Salix viminalis, L. (Basket Osier.) 

 Danvers, 1853 (Dr. Osgood's list). Eeported in Salem and one or 

 two other localities, but it can hardly be called a thoroughly nat- 

 uralized plant. Bigelow (Fl. Bost., 2d. ed., 1824) speaks of this 

 species as growing "In swamps at Danvers and elsewhere." As 

 he does not mention Salix sericea, it may be this species that is 

 referred to, as it is frequent in swamps in the vicinity of Danvers, 

 the leaves somewhat resembling those of S. viminalis. (Adv. from 

 Eu.) 



