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1907] MACDOUGAL—H VYBRIDIZATION OF WILD PLANTS 49 
viduals is presented, which without close examination of a large 
progeny might appear to be a hopeless medley. This is best illus- 
trated by a plant which has been studied recently in cultures at the 
Fic, 1.—A, leaf of Quercus rubra from N. Y. Botanical Garden; B, leaf of Q. 
Phellos collected at Ashland, N. J. Sept. 14, 1892; C, leaf of Q. heterophylla taken 
from tree from which acorns were taken for cultures, collected at Richmond Valley, 
Staten Island, N. Y., October 22, r905.— X}. 
New York Botanical Garden, and at the Desert Laboratory, Bartram’s 
oak, Quercus heterophylla. ; 
Bartrami’s oak was discovered as a single individual growing 
_ © a farm of Mr. John Bartram, near Philadelphia, on the banks of 
Mo. Bot.Garagen 
908 
