99 
Georgetown, as this species, are but small specimens of B. nigra. 
Not represented in the county herbarium. Very doubtful as a native 
of this region. 
Alnus incana, Willd. (SpeckLED OR Hoary ALDER.) 
Frequent in wet places. 
Alnus serrulata, Ait. (CoMMON ALDER.) 
By streams and moist roadsides. Abundant. 
SALICACEA, 
(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. R.). 
Salix tristis, Ait. (Dwarr Gray WILLOW.) 
_ Lynnfield, Danvers (J. H. Sears), etc. In places occupied by the 
Bear Oak. Not very common. 
Var. microphylla. (Gray’s Manual.) 
Essex County (Oakes). 
Salix humilis, Marshall. (Prarrte 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, Muhl. (Pussy WILLow). 
Common in damp places. 
Salix sericea, Marshall. (Sinxky WILLow.) 
Along streams. Not very common. 
Salix petiolaris, Smith. 
Middleton, Andover, Methuen, Chebacco, etc. Frequent. 
Salix purpurea, L. 
Swampscott, Salem, Newburyport. Introduced for basket work. 
(Adv. from Eu.) 
Salix viminalis, Z. (BaskerT OsI=ER.) 
Danvers, 1853 (Dr. Osgood’s list). Reported 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. (Ady. from 
Eu.) 
