EAST AMERICAN THORNS.* LIBRARY 



NEW YORK 

 BOTANICAL 



TOMENTOSAE. 



Crataegus obesa. A slender narrow crowned tree, seldom 

 exceeding 4 m in height, with nearly black scah* bark on the 

 armed trunk and slender orange or russet pubescent twigs 

 sparingly armed with short 2-3 cm-long thorns. Leaves 

 broadly ovate or nearly orbicular, 7-10 cm long, 5-7 cm wide, 

 rounded or broadly cuneate at base, with many pairs of short 

 ascending notches above the middle, dark green above, paler 

 and tomentose beneath, petioles margined above. Flowers, 

 appearing usually the first week in June in large compound 

 tomentose corymbs, are about 16 mm wide; stamens small, 

 20. Fruit, borne in large compound clusters, ripening in 

 September and falling after the leaves, is globose or slightly 

 oblong, 8-9 mm thick, scarlet, often capped by the very small 

 narrow reflexed lobes, or the lobes and tube projection decidu- 

 ous; fleshy pulpy, seed usually 2, hemispherical. 



St. Louis County, Missouri. Dr. N. M. Glatfelter. Appar- 

 ently frequent in eastern Missouri. 



TENUIFOLIAK. 



Crataegus uber. A slender tree 3-6 m high with thin 

 gray scaly bark on the trunk, and slender dull chestnut twigs 

 sparingly armed with 3-6 cm-long thorns. Leaves thin, glab- 

 rous, ovate or oval, 5-6 cm long, 4-6 cm wide, rounded or nar- 

 rowed at the broad, often oblique base, several pairs of short 

 acute ascending lobes from near the base; petiole slender, 

 3-4 cm long. Flowers, appearing about the 20th of May in 

 small loose compound many-flowered pubescent corymbs, are 

 about 20 mm wide; stamens 5-8, usually 5, anthers purple. 

 Fruit, borne in small compound clusters on long slender 



* Issued June 15. 1904. 



