98 BETULACE^. Alnus. 



300. Alnus maritima, Mulil. 

 Seaside Alder. 



Southern Delaware and eastern Maryland, near the coast ; valley 

 of the Red River, Indian Territory, in about longitude 96° 30' W. ; 

 Manchuria and Japan (A. maritima, Japonica, and arguta, Regel). 



A small tree, 6 to 7 metres in height, with a trunk 0.10 to 0.15 metre 

 in diameter ; borders of streams and swamps. 



Wood light, soft, close-grained, checking badly in drying ; medullary 

 rays broad, conspicuous ; color light bright brown, the sap-wood hardly 

 distinguishable, somewhat lighter. 



301. Alnus rubra, Bong. 

 Alder. 



Sitka, south through the islands and Coast Ranges of British Columbia, 

 western Washington, Oregon, and California to Santa Barbara, extending 

 east through the Blue Mountains of Washington and Oregon to northern 

 Montana. 



A large tree, 24 to 30 metres in height, with a trunk 0.90 to 1.20 

 metres in diameter, or in British Columbia and the Blue Mountains often 

 reduced to a low shrub ; bottom-lands and borders of streams ; most 

 common and reaching its greatest development in western Washington 

 and Oregon. 



Wood light, soft, not strong, brittle, very close-grained, compact, easily 

 worked, satiny, susceptible of a beautifid polish ; medullary rays distant, 

 broad; color light brown tinged with red, the sap-wood nearly white; 

 largely used in Oregon in the manufacture of furniture. 



302. Alnus rhombifolia, Nutt. 

 Alder. 



Valley of the lower Fraser River, British Columbia, south through the 

 Coast Ranges to southern California, extending east along the ranges of 

 Washington to Clear Creek, Idaho, and the valley of the Flathead River, 

 Montana. 



A small tree, 9 to 15 metres in height, with a trunk sometimes 0.00 to 0.90 

 metre in diameter, or toward its northern 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 

 rax s numerous, obscure ; color light brown, the sap-wood lighter, often 

 nearly white. 



303. Alnus oblongifolia, Torr. 



Alder. 

 San Bernardino and Cuyamaca Mountains, California, through the 

 ranges of southern Arizona and New Mexico to the valley of the upper 

 Rio Grande: in northern Mexico. 



