42 
hairs with the exception of the large conspicuous tufts in the axils of 
the veins on their lower surface which is light green and lustrous. 
Three other American species are established in the Arboretum, Tilia 
neglecta, T. heterophylla var. Michauxii and T. monticola. The first of 
these trees differs from Tilia glabra in the short, gray, finely attached 
pubescence which covers the lower surface of the leaves during the 
season and in the small inconspicuous tufts of axillary hairs. This is 
also a common northern tree which often grows with Tilia glabra and 
has usually been confused with it in books on American trees. It has 
a wide range from the valley of the St. Lawrence River in the Province 
of Quebec through the northern states, ranging southward along the 
Appalachian Mountains to North Carolina and westward to southwestern 
Missouri. This tree, which has not been many years in the Arboretum, 
has so far escaped the attacks of the red spider, and has grown rap- 
idly and proved to be a good tree here. Tilia heterophylla var. Mich- 
auxii is a northern variety of a species widely distributed in the south- 
eastern states. It differs from Tilia glabra and T. neglecta in the 
thick white down or tomentum which covers the lower surface of the 
leaves during the season and on the leaves of upper branches is often 
brown. This is a handsome tree with slender, reddish or yellowish 
brown branchlets and small, slightly flattened winter-buds. It occurs 
in western New York and is widely distributed southward from the 
valley of the Susquehanna and the lower Ohio Rivers, in the southern 
states being usually confined to the slopes of the Appalachian Moun- 
tains and their foothills. This tree is hardy in the Arboretum where 
it has grown more slowly than Tilia neglecta and T. monticola. This 
last is the most conspicuous of the American Lindens which have been 
satisfactorily tested in the Arboretum. It is the tree which has been 
incorrectly called Tilia heterophylla in most books in which American 
trees have been discussed. It is found only on the slopes of the south- 
ern Appalachian Mountains from Virginia to North Carolina and east- 
ern Tennessee, growing with Tilia heterophylla var. Michauxii. From 
that species it differs in its much stouter branchlets, much larger com- 
pressed winter-buds, larger leaves very oblique at the base, often seven 
or eight inches long, thickly covered below with white tomentum and 
hanging on long slender stalks. The flowers are larger than those of 
any other American Linden. This Linden has grown more rapidly in 
the Arboretum than Tilia heterophylla var. Michauxii and promises to 
be a valuable tree in northern parks. There are three Linden-trees in 
eastern Europe, Tilia platyphyllos, T. cor data and T. vulgaris. The 
first has yellowish green leaves covered on the lower surface with soft 
hairs which also cover the young branchlets. This is the first of the 
European Linden-trees to bloom in the Arboretum where it is growing 
with several of its abnormal varieties, including one with deeply divided 
leaves (var. asplenifolia), one with slightly lobed leaves (var. vitifolia), 
and another of pyramidal habit (var. pyramidalis) . These varieties 
are curious rather than beautiful, and have little to recommend them 
as ornamental trees. Tilia platyphyllos appears to be the common 
Linden sold by American nurserymen as “European Linden.” It is 
perfectly hardy but as an ornamental plant it is the least desirable 
here of the European Lindens. Much handsomer is the small-leaved 
Linden, Tilia cordata, which is the last of the Lindens in the collection 
