102 
GIGANTIC ARBOR VITJL 
THUJA gigantea, (Nuttall, Plants of Rocky Mountains, p. 52, ) # 
ramis ramulisque compressis erectis , foliis ovatis acutis arete quadrifa - 
riarn imbricatis intermediis convexis puncto impresso etuberculatis , stro~ 
bilis arete reflexis. Hooker, Flor. Bor. Am. 2, p. 165. 
Thuja Menziesii, Douglas, MSS. 
Thuja plicata. Lambert, Pin. No. 61, (in part.) 
This is one of the most majestic trees west of the Rocky 
Mountains, attaining the height of 60 to 170 or even 200 
feet, and being 20 to 40 feet in the circumference of the 
trunk. On the shores of the Pacific, where this species is 
frequent, it nowhere attains the enormous dimensions attri- 
buted to it in the fertile valleys of the Rocky Mountains, 
towards the sources of the Oregon. We seldom saw it 
along the coast more than 70 to 100 feet in height, still, 
however, much larger than the common species, (XI occi- 
dental is.) We observed it also on the banks of the Wah- 
lamet, and according to Douglas it is found north as far as 
Nootka Sound. It appears to have been also collected by 
Menzies. The largest trees seen by Captain Wyeth were 
growing on the alluvial borders of the Flat Head river. 
Its general aspect is a good deal similar to that of T. occi- 
dental is, but the branches are rounder and more erect, less 
flattened or ancipital ; in their colour they vary, for while 
some are green others are glaucous. The seeds are elliptic, 
and furnished with a wide alated margin. The leaves are 
always destitute of the glandular tubercle conspicuous in 
/ 
* Journal of the Academy of Natural Sciences, Philad. vol. 7. 
