42 _ HARPER: PLANT POPULATION OF MICHIGAN 
the glaciated region and coastal plain or nearly so* are scarcely 
represented here, presumably because the climate is a little too cold. 
A list of the commoner plants of the eastern part of{the Upper 
Peninsula, based wholly on car-window notes, was published by 
the writer a few yearsago.f In that a slightly different method of 
computation, which did not do justice to the conifers, was used, 
and the different sizes of trees and shrubs were not separated. 
But it is probably safe to say that Abies, Picea canadensis, Betula 
pumila, and Andromeda glaucophylla (to mention woody plants 
only) are more abundant in the Upper Peninsula than here; while 
the reverse is true of Acer saccharum, Tsuga, Fagus, Tilia, Ulmus, 
Acer pennsylvanicum, Sambucus, Rhus glabra (etc.), Diervilla, 
Rubus strigosus, Comptonia, Rubus allegheniensis (?), Rhus Toxico- 
dendron, Taxus canadensis, and a few others, most of which are 
not evergreen. 
Comparing this region with that adjoining it on the south we 
get a greater contrast, due to better soil and climate both. The 
commonest trees in the central third of lower Michigan (not count- 
ing the lake plains around Saginaw Bay, which are still more 
fertile), as determined from a few hours of car-window observa- 
tions, seem to be as follows: 
Quercus velutina (?), Pinus Banksiana,t P. Strobus, Ulmus 
americana, Larix laricina, Quercus borealis maxima (?), Acer sac- 
charum, Fagus, Thuja, Tsuga, Abies, Tilia, Pinus resinosa, Quercus 
alba, and Picea mariana. 
Still farther south the change in composition of vegetation 
continues in the same direction, and in extreme southern Michigan 
nearly all the trees are deciduous. 
COLLEGE Pornt, 
New Yor« 
a ee ee es 
* See Rhodora 7: 69-80. 1905; 8: 27-30. 1906. 
T Rep. Mich. Acad. Sci. 15: 193-198. 1914. 
f If I had left northern Michigan by way of the Michigan Central R. R. instead 
of the Pere Marquette, Pinus Banksiana would doubtless have stood higher in the 
first list and lower in the one on this page; for along the former railroad it is said to be 
abundant in Crawford and Roscommon Counties, while along the oe i saw it 
mostly in Lake and Newaygo Counties, south of the limits assigned in 
(See second map between pages 550 and 551 of the oth volume of the fab Census. ) 
