Reprinted with permission from the New 

 Britton and Brown Illustrated Flora of the 

 Northeastern United States and Adjacent 

 Canada, Vol. 2, page 42; Copyright 1952, 

 The New York Botanical Garden. 



QUERCUS MACROCARPA 

 BUR OAK 



Bur Oak is a small to large tree. Its bark is deeply fUrrowed and twigs are stout. The alternate, oblong-elliptic leaves are 

 10-20 cm in length and are deeply to shallowly lobed, with the terminal lobe being the largest. Leaves are dark green 

 and shiny above but silvery below with fine, star-shaped hairs. Male flowers of 5-10 stamens are borne in long, loose, 

 pendulous inflorescences from the leaf axils. 1 to several female flowers occur in the axils of new leaves. The acorn is 

 up to 2-4 cm long, ellipsoidal, and the top half or more is enclosed by a roughened, fringe-margined cup. 



Flowering in April-May. 



This is Montana's only native oak. 



