January, 1900. Bruncken — Distribution of Some Trees, etc. 35 
However that may be, young cottonwood trees are now quite com- 
mon along the JMenomonee River and in other similar situations. 
In addition to the neighborhood of the rivers and creeks, many 
seedlings and saplings are found scattered over the uplands, and 
even on sunbaked banks of clay. Whether these will grow into 
mature trees under conditions so very different from their ordi- 
nary habitat, is perhaps very doubtful. Here and there in similar 
localities as the cottonwood, and sometimes associated with it, 
seedlings and root suckers of the silver poplar, Po pubis alba, are 
met with, and thus that beautiful tree seems to be establishing 
itself away from cultivation. 
In one place, and only there, as far as known, can l)e found the 
balsam poplar, Populiis balsainifera, like the birches a distinctive- 
ly northern tree. The station is on the lake shore at Fox Point, 
in a ravine through which a little brook finds its way from the 
upland down to the lake. The largest specimen I have seen there 
measures 20 inches in breast-high diameter. There are many 
young trees of various ages, and the colony seems to be pros- 
perous. 
THE W^ILLOWS. 
W. M. Wheeler, in his "Flora of Milwaukee County," pub- 
lished in 1888, enumerates but three species of Salix, besides two 
•cultivated varieties, remarking, however, that ''there are undoubt- 
edly several other species in the county." In a supplementary list 
published the following year, he adds one more, 5^. liicida. The 
species named by. Wheeler are 5^. tristis, S. longifolia, Miihl., and 
S. myrtilloides, and the cultivated S. alba and S. znininalis. Fol- 
lowing is the list of species of willows found by me in that part 
of the county covered by this paper : 
6". nigra, S. nigra falcata, S. aniygdaloidcs, S. Huviatilis ( = S. 
longifolia MiihL), S. discolor, S. cordata, S. Bebbiana Sarg. 
{j=S. rostrata), S. Incida, and S. myrtilloides. S. tristis, which 
is said by Wheeler to occur along the Kinnickinnic River, I have 
not found myself, but have no reason to doubt the correctness of 
the prior observation. There are, accordingly, ten species of wil- 
lows growing wild in this neighborhood, besides several apparent 
local varieties or hybrids. Occasionally also a specimen of 6". 
alba, wdiich species is very commonly planted as a shade tree, is 
found escaped from cultivation. 
There is hardly any situation in which one may not occasional- 
ly find a willow ; like the cottonwood they even invade the parched 
clay banks. But there are three types of localities, where willows 
form a conspicuous and often dominant vegetation, giving char- 
acter to the landscape. These types are the banks of the three 
