74 



TREES OF THE NORTHERN UNITED STATES 



X. Cliva Hercules. 



9, ovate-oblong, downy when young. 

 Flowers appear before the leaves. Shrub, 

 scarcely at all tree-like, with bark, leaves, 

 and pods very pungent and aromatic. 

 Common north, and sometimes culti- 

 vated. 



2. Xanthoxylum Clava H6rcules, L. 

 (SOUTHERN PRICKLY-ASH.) Leaflets 7 

 to 17, ovate to ovate-oblong, oblique at 

 base, shining above. Flowers appear 

 after the leaves. A small tree with very 

 sharp prickles. Sandy coast of Virginia 

 and southward; occasionally cultivated 

 in the north. 



GENUS 13. PTELEA. 



Shrub with compound leaves of three leaflets, greenish, 

 white flowers in terminal cymes, 

 and 2-seeded fruit with a broad- 

 winged margin, somewhat like the 

 Elm, only larger. 



Ptelea trifoliata, L. (HOP-TREE. 

 SHRUBBY TREFOIL.) Leaflets ovate, 

 pointed, downy when young. Flowers 

 with a disagreeable odor; fruit bitter, 

 somewhat like hops. A tall shrub, often, 

 when cultivated, trimmed into a tree-like 

 form. Wild, in rocky places, in southern 

 New York and southward. 



GENUS 14. PHELLODENDRON. 



Leaves opposite, odd-pinnate. Flowers dioscious; so 

 only a portion of the trees bear the small, odoriferous, 

 5-seeded, drupe-like fruit. 



Phellod6ndron Amur6nse. (CHINESE CORK-TREE.) Leaves op- 

 posite, odd-pinnate, l!o to 3ft. long; leaflets 9 to many, lanceolate, 



