162 Proceedino^s of the Ohio State Academy of Science 



It is troublesome from sprouting from the roots. Penn. and Ohio 

 to Ga., Iowa, Kan., and Okl. 



2. Robinia viscosa \ ent. L'lanim\' Locust. A small tree 

 with rough bark. Underground parts somewhat poisonous. \'a. 

 to Ga. Also esca])ed in Middle and Eastern States. Ohio. 



Order, Geraniales. 



Rutaccac. Rue Family. 

 49. Xanthoxylum L. Prickly-ash. 



Trees or shrubs with punctate, odd-pinnate leaves and usually 

 with stipular spines. Capsule with 1-2 seeds. 



I. Xanthoxylum americanum Mill. Prickl}-ash. A 

 prickly shrub or small tree with small flowers in sessile axillary 

 cymes. Quebec to \'a.. S. Dak.. Xeb.. Kan., and Ohio. 



50. Ptelea L. Ili)])tree. 



Shrubs or small trees with bitter bark. Fruit a samara with 

 a membranous wing. 



I. Ptelea trifoliata L. Hoptree. A shrul,i or small tree 

 with sunken superposed axillary buds covered by the petiole base. 

 Bark and flowers with a disagreeable odor. Conn, to Fla., Ont.^ 

 ]\Iinn., Kan., Tex., and ( )hio. 



Simanihaccae. Ailanthus Family. 

 51. Ailanthus Desf. Ailanthus. 



Large trees with odd-pinnate leaves ; branches robust with 

 large brown pith. Samara linear or oblong, usually twisted. 



I. Ailanthus glandulosa Desf. Tree-of-heaven. A large 

 tree of rapid growth with thick Ijranches and smooth bark. 

 Leaves ill-scented ; leaflets with green glands under the lobes or 

 teeth. Autumn leaves pure yellow. Wood hard and useful. 

 Sprouts freely from the roots and is easilv propagated from root 

 cuttings. A pest in pastures in some states ; cows will not eat 

 grass near the young shoots. \\'ater contaminated by the leaves 

 is poisonous. Naturalized from China. Ont. to Mass.. Va.,. 

 Kan., and Ohio. 



