67 
conifers in the whole collection in which there are fortunately several 
individuals. The only objection to this tree is that it often loses its 
leader by the attacks of the borer which so often destroys that of the 
native White Pine. In southeastern Europe, where the Servian Spruce 
is widely distributed and forms great forests, it is an important timber 
tree, growing up to a height of one hundred and thirty feet, with a 
girth of trunk of not more than four feet. 
Picea Glehnii is a native of northern Japan and Saghalin where it 
was discovered by a Russian botanist in 1861. Seeds of this tree are 
said to have reached Europe in 1871; those of the Japanese tree were 
planted in the Arboretum in 1892. It is of course too soon to speak 
with much authority about the value of this tree in eastern America. 
The Arboretum trees have grown rapidly, are perfectly hardy, and are 
certainly the most satisfactory here of the Japanese Spruces. Judging 
by the latitude of its native home, this Spruce should prove hardy far 
north in eastern America. 
Abies concolor, the Rocky Mountain form of the White Fir of west- 
ern America, was first raised in the Arboretum in 1874 from seeds col- 
lected by Dr. Engelmann on the Spanish Peaks of southern Colorado. 
It is said that a few seeds of this tree reached Europe from New Mex- 
ico two years earlier, but the statement needs confirmation. There 
are good specimens in the Arboretum raised from Dr. Engelmann ’s 
seeds nearly sixty feet high and with trunks still clothed with branches 
to the ground, and this Colorado tree must with our present knowledge 
be considered the best Fir-tree which can be grown in the northeastern 
states. Its only rival here is the Japanese Ahiesi homolepis which was 
introduced into the United States in the early sixties through the Par- 
sons Nursery, but has only recently been appreciated and is still rare 
in American collections. Abies concolor is now one of the most gener- 
ally planted conifers in the eastern states. 
Thuya plicata, the Red Cedar of the northwest, is one of the great 
trees of the world, often growing in western Oregon and Washington 
to a height of two hundred feet with a trunk fifteen feet in diameter. 
Plants raised from seeds gathered in the coast region have never proved 
hardy in the eastern states, but fortunately this tree — of less gigantic 
s.ze— ranges eastward to the eastern slope of the continental divide 
in Montana, and in 1880 seeds collected near Fort Coeur d'Alene in 
Idaho by Dr. Sereno Watson were planted at the Arboretum. The 
plants raised from these seeds have grown rapidly and have proved 
perfectly hardy, and are now the handsomest trees of their class in 
the collection. Like other Arbor Vitaes this tree is easily propagated 
by cuttings and a few American nurserymen are beginning to appre- 
ciate its beauty and value. One of the valuable timber trees of North 
America, this tree now promises to play its part in the decoration of 
eastern parks and gardens. 
Juniperus chinensis var. Sargentii is generally considered the hand- 
somest of the numerous Junipers with prostrate stems which are now 
known in gardens. It was first raised at the Arboretum in 1893 from 
