IOWA ACADEMY OF SCIENCES. 



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Figure 3. P. fusca Rafln. a— longitudinal section, b— cross section. 

 PYRUS ANGUSTIFOLIA AITON. 



Pyrus angustifolia Art. Hort. Kew ed. 1. 11: 176 America. 1789. 



Pyrus coronaria Wangend. Nord. Am. Holzart 61. t. 21. f. 47. 

 1787. 



Pyrus sempervirens Willd. Enum. Hort. Berol. Suppl. 35. 

 1813. 



A tree about twenty-five feet in height, stem six to eight 

 inches in diameter; bark thin, scales small, dark brown; 

 branchlets at first sparingly pubescent, brown, becoming lead- 

 colored; leaves lanceolate oblong to narrow oval, apex acute or 



