Proceedi)io;s of flic Ohio State Academy of Science 151 



Order, Rosales. 



Rosaceae. Rose Family. 



Poniatae. Apple Subfamily. 



36. Sorbus L. Alounlain-ash. 



Trees or shrubs with odd-piunate leaves, the leaflets serrate. 

 Fruit a small red berry-like pome in compound cymes, 

 i. Leaflets glal)rous above. 2. 



1. Leaflets pubescent on both sides; calyx and pedicels usually woolly. 



5". aiicuparia. 



2. Leaflets long-acuminate: fruit less than \ in. in diameter. S. 



ainci'icana. 

 ■1. Leaflets obtuse or short-pointed: fruit more than -{- in. in diameter. 

 S. sauibiiciffllia. 



1. Sorbus americana Marsh. American Alountain-ash. 

 A small tree with smooth bark. Bark and unripe fruit very as- 

 tringent. In moist ground. Aluch prized for ornamental plant- 

 ing. Xewf., Alan., X. Car., and Alich. 



2. Sorbus sambucifolia ( C. & S. ) Roem. Elderleaf 

 Alountain-ash. A small tree with smooth bark. In moist 

 ground. Lab. to Alaska, X. Eng.. Ohio, Mich., and in Rocky 

 Mts. to Colo, and l/tah. 



3. Sorbus aucuparia L. European Mountain-ash. A 

 small tree, native of Europe. Frequently cultivated. Fruit i)oi- 

 sonous to man. biu eaten by some birds. X. S. to X. H. 



37. Pyrus L. Pear. 



Trees or shrul)s with simple leaves. Fruit a pome, its flesh 

 containing grit-cells. 



I. Pyrus commianis L. Pear. A pyramidal usually 

 slender tree, often with thorn-like stunted branches. Bark 

 smooth. Cultivated for its large fleshy fruit. Xative of Europe 

 and Asia. Ale to .\. J. and Ohio. 



38. Malus Hill. ADple. Crab-apple. 



Trees or shrubs with simple leaves. Fruit a fleshv pome 

 without grit-cells. 



