ROSACEAE— PYRUS 



513 



Fig. 274. Iowa Crab {Pynis ioensis). 1. Flowering branch. 

 2. Longitudinal section of flower with petals removed, natural 

 size. 3. Fruiting branch. 4. Longitudinal section of fruit. 5. 

 Summer branch. 1, 3, 4, 5, one-half natural size. (M. M. Cheney). 



Crataegus L. Hawthorn. White Thorn 



Shrubs or small trees, usually spiny; leaves petioled; flowers in corymbose 

 clusters, white or pink; calyx-tube urn-shaped; limb 5-cleft; petals 5, roundish; 

 stamens numerous or few; styles 1-5; fruit a pome, containing 1-5 bony, 1-seed- 

 ed stones. About 75 species, although the number is sometimes estimated as 

 high as 125. Some species, like C. punctata, and C. mollis, are ornamental. 



Crataegus mollis Scheele 



Shrub or small tree; shoots densely pubescent; leaves large, slender-petioled, 

 cuneate, truncate or cordate at base, usually with acute lobes ; more or less 

 densely pubescent beneath ; flowers large, 1 inch across ; fruit bright scarlet with 

 a light bloom. 



