BOTANY. 
I 28 
Liquidambar , Nyssa, Sassafras, Celtis, Morns, Carya, Quercus , Cas- 
tanea, Juniperus, Plat anus S On the other hand, one of the most 
abundant and characteristic forest trees of the mountains, the Yellow 
Birch ( Bztula httea Michx.), extends only as a chance straggler into 
the lower country. I his species, however, among the deciduous 
trees, and the Balsam Fir and Black Spruce ( Abies balsamea Marshall, 
and A. nigra Poir.) among the evergreens, were the only larger trees 
which the contrasted Flora does not also possess. Continuing the list 
of important absences from the mpuntain P'lora, the following genera 
and species of smaller trees, shrubs, and woody plants may be 
mentioned : Euonymus , Cornus florida L., Viburnum prunifolium L. 
Vaccinium vacillans Sol., Leucotho'e, Andromeda ligustrina Muhh, 
Clethra, Azalea viscosa L., Lindera, Myrica , and Alnus sermdata Ait. 
Oi the arborescent and woody vegetation of the mountains the fol- 
lowing species I have never observed about Riverdale : Acer Penn- 
sylvanicum _ L., and A. spicatum Lam., Pyrus Americana DeC., Ame- 
lanchier Canadensis oligocarpa Gray, Ribes Cynosbati L., R. rotundi- 
foliumWxch x., R. lacustre Poir., R. proslratum L'FIer., and R. hirtellum 
Michx., Lonicera ciliata Muhl., Sambucus pubens Michx. (occurs on 
Palisades in Lower Hudson Valley), Viburnum nudum cassinoides 
Gray, V. opulus L., V. lantanoides Michx., Rhododendron maximum 
L., Ilex Icevigata Gray, Corylus rostrata Ait., Paxus baccata Cana- 
densis Gray, Nemopanthes Canadensis DeC. 
The foregoing comparison is, of course, merely a superficial one 
dealing only with more prominent species, and many other names 
might have been mentioned. 
More than three hundred and twenty-five species of trees and 
plants, exclusive of Vascular Cryptogams, were observed during my 
stay in the mountains, and of these the names of some seventy-five 
do not appear on my records of the Riverdale Flora. Nearly fifty 
of the number mentioned, however, are not indigenous to the region, 
* Representatives of the latter five were noticed sparingly in the main valley, but did not occur 
in the mountains. 
