256 THE EVOLUTION OF OUR NATIVE FEUITS 



times. For example, Michaux left two specimens of 

 Pyrus angustifolia in his herbarium at Paris, one 

 of which is ticketed Mains 

 angustifolia and the other 

 Mains coronaria, the latter 

 said to grow in "Pennsyl- 

 vania et Virginia." 



Pyrus coronaria 

 and P. angustifolia 

 are essentially smooth 

 species, and the young 

 wood is dense and 

 hard. The young 

 leaves and 

 "< shoots are some- 

 Mimes thinly 

 ^ -__ ( hairy, but they 

 / soon become 

 '< smooth. The 

 western types are 

 essentially pubescent 

 species, and the 

 young growth is 

 thicker and softer ; 

 and the pubescence 

 is floccose or woolly, 

 and persists upon the 

 under surface of the 

 leaves throughout the 

 season. 



3. The prairie states crab (Pyrus loensis, Bailey, 

 Ainer. Gard. xii. 473. Pyrus coronaria, var. loensis, 

 Wood, Cl. Bk. Botany, 333, 1860). Leaves rather 



Fig. 45. 

 Leaf of Pyrus coronaria. 



