Proceedin^^s of the Ohio State Academy of Science 151 



Order, Rosales. 



Rosaceae. Rose Family. 



Pomatae. Apple Subfamily. 



36. Sorbus L. Mountain-ash. 



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

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

 1. Leaflets glabrous above. 2. 



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



S. aiicuparia. 



2. Leaflets long-acuminate; fruit less than :1 in. in diameter. 5". 



americana. 

 2. Leaflets obtuse or short-pointed; fruit more than ^ in. in diameter. 

 S. saiiibncifolia. 



1. Sorbus americana Marsh. American Mountain-ash. 

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

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

 ing. Newf., Man., N. Car., and Mich. 



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

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

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

 Mts. to Colo, and Utah. 



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

 small tree, native of Europe. Frequently cultivated. Fruit poi- 

 sonous to man, but eaten by some birds. N. S. to N. H. 



37. Pyrus L. Pear. 



Trees or shrubs with simple leaves. Fruit a pome, its flesh 

 ■containing grit-cells. 



I. Pyrus communis L. Pear. A pyramidal usually 

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

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

 and Asia. Me to N. J. and Ohio. 



38. Malus ITill. Apple, Cralvapple. 



Trees or shrubs with simple leaves. Fruit a fleshy pome 

 without grit-cells. 



