CATALOGUE OF FOREST TREES. 163 



301. Alnus rubra, Bongard, 



Mem. Acad. St. Petersburg, 6 ser. ii, 102. Hooker, Fl. Bor.-Am. ii, 158. Spach in Ann. Sci. Nat. 2 ser. xv, 205. Endllcher, Genera, 

 Suppl. iv', 21. Lyall in Jour. Linuiean Soc. vii,134. Regel in Bull. Soc. Nat. Moscow, xxxviii'', 429; De Candolle, Prodr. xvi', 

 186. Torrey, Bot. Wilkes Exped. 467. Watson, Bot. California, ii, 80. G. M. Dawson in Canadian Nat. new ser. ix,331. 



?A. glutinosa, Pursh.Fl. Am. Sex)t. ii,622 [not Willdenow]. 



A. Oregana, Nnttall, Sylva, i,28, t. 9; 2 ed. i, 44, t. 9. Newberry in Pacliio E. R. Rep. vi, 25, 89. Cooper in Smithsonian 

 Rep. 1858,261; Pacific R. R. Rep. xii,28, 68. Vasey, Cat. Forest Trees, 28. Hall in Coulter's Bot. Gazette, ii, 91. 



A. incana, var. rubra, Regel iu Mem. Soc. Nat. Moscow, xix, 157, t. 17, f. 3-4. 



ALDER. 



Sitka, south through the islands and Coast ranges of British Columbia, Washington territory, Oregon, and 

 California to Santa Barbara, extending east through the Blue mountains to northern Montana. 



A large tree, 24 to 30 meters in height, with a trunk 0.90 to 1.20 meter in diameter, or in British Columbia 

 and the Blue mountains often reduced to a low shrub; river bottom lauds and borders of streams; most common 

 and reaching its greatest development along the large streams of western Washington territory and Oregon. 



Wood light, soft, not strong, brittle, very close-grained, compact, easily worked, satiny, susceptible of a 

 beautiful polish; medullary rays distant, broad; color, light brown tinged with red, the sap-wood nearly white; 

 specific gravity, 0.4813; ash, 0.42; largely used in Oregon in the manufacture of furniture. 



302. Alnus rhombifolia, Nnttall, 

 Sylva, i, 33; 2 ed. i, 49. Torrey, Bot. Wilkes Exped. 467. Vasey, Cat. Forest Trees, 26. Watson, Bot. California, ii, 80. 

 A. glutinosa, var. serrulata, Regel in Mem. Soc. Nat. Moscow, xix, 164, in part. 



A. serrulata, var. rugosa, Regel in Bull. Soc. Nat. Moscow, xxxviii<, 432, in part; De Candolle, Prodr. xvi^, 188, in part. 



ALDER. 



Valley of the lower Fraser river, British Columbia, south through the Coast ranges to southern California, 

 extending east along the ranges of Washington territory to Clear creek, Idaho ( Watson), and the valley of the 

 Flathead river, Montana (Canby & Sargent). 



A small tree, 9 to 15 meters iu height, with a trunk sometimes 0.60 to 0.90 meter in diameter, or toward its 

 northeru and eastern limits reduced to a shrub ; borders of streams ; the common alder of the California valleys. 



Wood light, soft, not strong, brittle, close-grained, compact; medullary rays numerous, obscure; color, light 

 brown, the sap-wood lighter, often nearly white; specific gravity, 0.4127; ash, 0.31. 



303. Alnus oblongifolia, Torrey, 



Bot. Mex. Boundary Survey, 204. Cooper in Smithsonian Rep. 1858, 266. Watson in PI. Wheeler, 17; Bot. California, ii, 80. 

 Rothrock in Wheeler's Rep. vi,239. Kusby in Bull. Torrey Bot. Club, ix,79. 



A. serrulata, var. oblongifolia, Regel in Bull. Soc. Nat. Moscow, xxxviii^, 443; De Candolle, Prodr. xvp, 188. 



ALDER. 



San Bernardmo and Cayumaca mountains, California, through the ranges of southern Arizona and southern 

 New Mexico to the valley of the Eio Grande; southward into Mexico. 



A tree 15 to 21 meters in height, with a trunk 0.90 to 1.20 meter in diameter; borders of streams in deep 

 mountain canons. 



Wood light, soft, not strong, brittle, close-grained, compact; medullary rays numerous, very obscure; color, 

 light brown tinged with yellow, the sap-wood nearly white; specific gravity, 0.3981; ash, 0.42. 



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