P. coccinea. Italy to W. Asia (My.-Jn.). 
P. c. Lalandii. 
P. crenato-serrata (P. Gibbsii). C. and W. China (My.-Jy.). 
P. crenulata. Himal. 
P. c. Rogersiana. S.W. China. 
PYRUS, Rosaceae. Pear. Medium or small trees, handsome in 
flower but susceptible to fire blight disease [5J, 6K]. 
P. amygdaliformis persica. W. Asia. 
P. betulaefolia. N. China. 
P. Bretschneideri. N. China. 
P. Calleryana. China. 
P. congesta (P. betulaefolia x elaeagnifolia). 
P. nivalis. Snow P.; S. Eu. 
QUERCUS, Fagaceae. Oak. Large or small deep-rooting trees. 
The leaves vary greatly in size and shape. Narrow-leaved forms 
such as Q. Phellos and Q. imbricaria deserve to be more widely 
grown, and also the large-leaved Q. dentata and £). macro- 
carpa. The evergreen Q. glauca has over-wintered at the Gar¬ 
den with only slight injury to the tips of the leaves for the last 
three winters [1D, 1E, nursery]. 
Q. acutissima (Q. serrata). Japan, Korea, China, Himal. 
Q. alba. White O.; Me. to Fla. and Tex. 
£). bicolor. Swamp White O.; Que. to Ga. 
Q- borealis maxima. Red O.; N. S. to Fla. and Tex. 
Q. Cerris. Turkey O.; S. Eu., W. Asia. 
Q. Chenii. China. 
Q- coccinea. Scarlet O.; Me. to Fla. and Mo. 
Q. Dalechampii (Q. lanuginosa Tenorei). S.E. Eu. to Italy. 
Q. dentata. Japan, Korea, China. 
Q.- ellipsoidalis. Man. to Mich, and Iowa. 
Q. e. sphaerocarya. 
Q- exacta (Q. imbricaria x palustris). 
Q. falcata (Q. rubra). Spanish O.; N. J. to Fla. and Tex. 
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