40 MISC. PUBLICATION 303, U. S. DEPT. OF AGRICULTURE 



emergency food of pinnated grouse; brown mountain beaver, fox squirrel, 

 moose; species other than A. pennsylvanicum and A. spicatum (q. v. ) in times 

 of necessity are cut for food and building materials by beaver. Eaten to some 

 extent by muskrat. The western species furnish good browse for livestock. 



Acer barbatum, see Acer saccharum. 

 Acer bernardinum, see Acer glabrum. 

 Acer brachypterum, see Acer floridanum. 

 Acer californicum, see Acer negundo. 



Acer circinatum Pursh. Vine maple. 



Range: 1, 2, 4. 



Site: Well-drained, moist, sun, shade. 



Fruit : Samara, available in September. 



A large shrub to a small or rarely large tree; branches commonly rest on 

 the ground, where they may root; slow growing, lives 80 to 90 years; wood 

 used to some extent locally ; will not furnish maple sugar ; about 5,000 seeds 

 per pound. 



Observations: Considered to rank with A. macrophyllum as third in im- 

 portance as browse for Olympic wapiti ; Pacific mountain beaver. Of some 

 importance as livestock browse. 



Acer dasycarpum, see Acer saccharinum. 

 Acer donglasii, see Acer glabrum. 



Acer floridanum (Chapm.) Pax. Southern sugar maple. 



A. saccharinum floridanum Chapm., Saocharodendron floridanum (Chapm.) 

 Nieuwl. 



Range: 28, 29, 30. 

 \ Site: Well-drained, moist, sun. 



Fruit : Samara. 



A large tree closely related to A. saccharum. 



Var. villipes Rehder (A. brachypterum Woot. and Standl.), occurs also in 

 region 11. 



Acer glabrum Torr. Dwarf maple. 



A. tripartitum Nutt., A. bernardinum Abrams, A. neomexicanum Greene. 

 Range : 4, 9, 12, 13, 14, 15. 

 Site : Dry, well-drained, sun. 

 Fruit : Samara ; available in late autumn. 



Rarely a large shrub, commonly a small to large tree ; usually dioecious and 

 growing in poor soils ; 13,000-20,000 seeds per pound. 



Var. douolasii (Hook.) Dippel, (A. douglasii Hook.) occurs with the species 

 in regions 4 and 12. < 



Stomach records: Mountain sheep, plains white-tailed deer. Observations: 

 Fair browse for mule deer. 



Acer grandidentatum Nutt. Bigtooth maple. 



A. saccharum grandidentatum (Nutt.) Sudw. 

 Range : 7, 8, 9, 11, 12, 13, 14, 16, 19. 

 Site : Well-drained, sun. 

 Fruit : Samara ; available in September. 

 A large shrub to large tree; flowers April-May. 



Acer interier, see Acer negundo. 

 Acer kingii, see Acer negundo. 



Acer leucoderme Small. Whitebark maple. 



Saccharodendron leucoderme (Small) Nieuwl. 

 Range: 28, 29. 



Site: Dry, well-drained, shade. 

 Fruit : Samara, available in September. 



A large shrub to small or large tree often with a crooked trunk; flowers in 

 April. 



Acer macrophyllum Pursh. Bigleaf maple. 



Range : 1, 2, 3, 4, 5. 

 Site: Well-drained, moist, sun, shade. 

 Fruit: Samara, available July-September or persistent until winter. 



