13 



RUE FAMILY. RUTACEAE. 



This group comprises a large number of plants in warm regions. 



Of the trees not more than two Of three will be found native to the 

 State. 



THE PRICKLY ASHES. Genus XANTHOXYLUM. 



Xanthoxxlum from two Greek words meaning Yellow Wood. 



Trees and shrubs of a large number oi species, five of which are 

 found in the United Stal 



PRICKLY ASH. TOOTH-ACHE TREE. 

 Xanthoxylum Clava-Hercules. 



This tree of small size has been reported as occuring in the south- 

 eastern corner oi the State, hut has not been found by the writer. 

 The peculiar color and appearance of the bark are very characteristic 

 "This is smooth and studded with scattered barnacle-like corky bos- 

 sess each tipped with a thick sharp spine which, however, finally 

 falls away. A fancied resemblance in these spiked trunks to the club 

 of Hercules has suggested its specific name, and the hooked spines 

 of its branches has given it its apt colloquial names, "Wait-a-bit and 

 "Tear-blanket" while its pungent bark has given it the name "Sting- 

 tongue" among the southern negroes. This property, too, as a source 

 of relief in tooth-ache has eatised it to be known as "Tooth-ache Tree.'' 



— Hough. 



THE WAFER ASHES. Genus PTELEA. 



Small trees and shrubs. Five or six species are native to United 

 States and Mexico. Only one grown tree-like, but it is wildly dis- 

 tributed. 



WAFER ASH. HOP-TREE. SHRUBBY TREFOIL. 



Ptclca trifoliata. 



rtclca. fr< m the Greek, classical name of the elm and applied to this genu-, 

 because cf the elm like fruit. Trifoliata. the three parted compound leaf. 



This shrub often growing with the true shape of a tree never at- 

 tains a height cf more than a few feet (6-10). The fruit resembles 

 that of the elm but is larger. The fruit and the compound leaf of 

 three leaflets readily characterizes this tree. It is known to occur 

 from the east side to a- far west as Alva in Woods County. 



Genus PHELLi >DENDR< >\\ 



CHINESE CORK TREE. 

 Phellodendron . Imurcnse. 



An intn iduced tree with c< impi >und leaves resembling those of the 



