74 TREES OF THE NORTHERN UNITED STATES 
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. Xanthoéxylum Clava Hércules, L. 
(SourTHERN Prickuy-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; oceasionally cultivated 
X. Clava Hércules. in the north. 
Genus 18. 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. 
Ptélea trifoliata, L. (Hop-TREs. 
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 more or less regularly opposite, odd-pinnate. 
Flowers dicecious; so only a portion of the trees bear the 
small, odoriferous, 5-seeded, drupe-like fruit. 
Phellodéndron Amurénse. (CuINEsE Cork-TrEE.) Leaves 
opposite, odd-pinnate, 132 to 3 ft. long; leaflets 3 (even 1) to 
