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LANDSCAPE GARDENING. 
noblest addition this genus ever received. Accustomed as we 
are to regard the Arbor vitae as a small bush, principally avail- 
able for hedging or single specimens, ten to twenty feet high, 
for small villa-gardens and village-yards, we shall find it diffi- 
cult to realize that we are to have an arbor vitae reaching to 
the dignity of a majestic tree, one hundred and forty feet up- 
right, with a fine umbrella-shaped top and picturesque head. 
This is another of the giants from the Columbia river and 
Nootka sound. Mr. Jeffrey discovered it along the banks of 
Scott’s river, and sent it home to England as Thuja Craigiana. 
Mr. Nuttall, in his Rocky Mountain expedition, also discovered 
it, and gave it the name of Thu. gigantea; and finally, Dr. 
Torrey has classed it as a Lihocedrus , and distinguished it as 
decurrens. It has since again been discovered in California, 
in 1853, by M. Borusier de la Riviere. 
It has been discovered so many times, by different people, 
and received different names, that a good deal of confusion 
exists about it, and it is often confounded with another Thu. 
qigantea — so named by Sir William Hooker, in his American 
Flora — but which, though coming from California, is a more 
slender tree, not over fifty feet, and is beyond doubt, the true 
Thu. Menziesii , which is also sometimes called Thu. plicata , 
and very much resembling the American arbor vitae. In fact, 
it would seem as if there often existed among Arbor vitaes 
botanical rather than physical differences, which often, as in 
this case, and that of the Siberian Arbor vitae, produces great 
perplexity. 
As these two giganteas are completely mixed up, we will 
describe them separately, with the hope of throwing some light 
upon their difference. 
The real Thu. gigantea has its branches rather erect , long, 
slender, and spreading laterally, with numerous smaller ones ; 
branchlets, short, flattened, channeled along the sides ; leaves, 
awl-shaped, lanceolate, loosely imbricated in four rows , the 
outer pair being the longest, and folded partially over the inner 
pair on both sides, giving the young shoots a trident-like ap- 
pearance. 
The Thu. Menziesii , on the contrary, has its branches spread- 
ing , flat, more or less horizontal, slender, and of a deep brown 
