CUPULIFERS. SILVA OF NORTH AMERICA. 33 
Ostrya, the classical name of the Hop Hornbeam, was adopted by Micheli! for these trees, which 
were afterward united by Linnus with the Hornbeams in his genus Carpinus. 
1 Nov. Pl. Gen. 223, t. 104. 
CONSPECTUS OF THE NORTH AMERICAN SPECIES. 
Leaves oblong-lanceolate, acuminate or acute at the apex... - ee eee eee ee sO O72 Vir ana. 
Leaves oval or obovate, acute or rounded atthe apex. «we ee ee we ee ew ee 6 O. Knowrrtont. 
