194 TREES OF THE NORTHERN UNITED STATES 
T. occidentalis. 
1. Thiya occidentalis, L. (AMERICAN 
ARBOR-VITZ. WHITE CEDAR.) Leaves 
in 4 rows on the 2-edged branchlets, hav- 
ing a strong aromatic odor when bruised. 
Cones oblong, 14 in. long, with few (6 to 
10) pointless scales, A small tree, 20 to 
50 ft. high, or in cultivation 1 to 50 ft. 
high, with pale, shreddy bark, and light, 
soft, but very durable wood. Wild north, 
and extensively cultivated throughout 
under more than a score of named vari- 
eties. Their names—alba, aurea, glauca, 
conica, globosa, pyramidalis, pendula, ete.— 
will give some idea of the variations in 
color, form, ete. 
2. Thiya gigantea, Nutt. (Giant AR- 
BOR-VIT#.) Leaves scale-shaped, some- 
what 4-sided, closely overlapping, sharp- 
pointed, slightly tuberculate on the back; 
cones more or less clustered and nearly 1, 
in. long. A very large and graceful tree, 
200 ft. high; with reddish, soft wood; from 
the Pacific coast; introduced but not very 
successfully grown in the Atlantic States. 
T. gigantea. 
T. dolabrata. 
4, Thiya orientalis, L. 
3. Thiya dolabrata, L. (Harcuet- 
LEAVED ARBOR-VIT&.) Leaves large, 
sometimes 14 in. long, very blunt, in 4 
rows on the flattened spray. Cones quite 
small, ovate, sessile, with jagged edges; 
scales reflexed and wedge-form. A small 
conical tree with horizontal branches and 
drooping branchlets; which, because of 
‘its large leaves (for an Arbor-vite) and 
flexible branchlets, is quite unique and 
interesting. In shaded and moist places 
it has done quite well as far north as 
New York. 
(EASTERN OR CHINESE ARBOR-VITZ.) | 
Leaves small, in 4 opposite rows, appressed, acute, on the numer- 
ous 2-edged branchlets. Cones large, roundish, with thick leathery 
