XANTHOXYLUM 



SI 



Xanthoxylum americanum Miller 1768 Prickly Ash 

 Toothache Tree 



Small tree or shrub, 10-25 ft. high, 2-6 in. diam. ; leaves odd-pinnate, 

 of 7-11 leaflets, 10-20 cm. long, the axis with scattered sharp prickles on 

 the lower side, leaflets elliptic, ovate, or obovate, margin minutely glan- 

 dular-indented, tip blunt, base rounded, sparsely hairy on both faces, 3-6 

 cm. long, 2-4 cm. wide, petioles usually brown-hairy, prickly with two 

 large stipule-like prickles at base, 2-5 cm. long; flowers appearing before 

 the leaves, small, greenish in axillary clusters, usually dioecious, calyx 

 lacking, capsules dark brown or blackish when mature, ellipsoid or ovoid, 

 rugose, 5-6 mm. long, 3 mm. wide; seeds black; americanum, re- 

 ferring to its home. 



Frequent along streams and the edges of woodlands; Quebec- Va-Mo- 

 Nebr-Minn-Ont. 



