a v b c d e 4 32 



e* Leaflets 11-21, short-stemmed, oblong, obtuse or rounded b., rounded and 

 notched or bristle-tipped a.; fr. pod. 



f Petioles and branchlets glabrous LOCUST (Robinia Pseudacacia ) . 



f2 Petioles and branchlets viscid CLAMY LOCUST (R. viscosa). 



e 5 12-25, short-stemmed, lance-falcate; fr. drupe. 



WESTERN SOAPBERRY (Sapindus Drummondii). 

 d 2 Entire, but remotely serrate toward a.; stem winged between the leaflets; fr. 



crimson drupelets DWARF SUMACH (Rhus capattina). 



ds Entire, but with 1-4 glandular teeth at b.; fr. twisted samara. 



TREE-OF-HEAVEN (Ailanthus glandulosa). 

 d* Serrate; 



e Leaflets 3-11, the lateral sessile, and successively larger towards the terminal 



one; fr. a nut enveloped in a 4-valved woody husk; leaflets 

 f 3-5, lanceolate; nut small, compressed, 



g 4-angled; husk rather thick and parting to b. 



SOUTHERN SHELL-BARK HICKORY (H. Carolinae-Septentrionalii) . 

 g 2 Scarcely angled, husk rough, very thin and splitting with difficulty if 



at all NORTHERN HICKORY (H. borealis). 



f2 5, lance-ovate to obovate; fr. with very thick husk splitting freely to b. 



SHAG-BARK HICKORY (H. ovata). 

 fs Both 5 and 7; fruit 



g More or less compressed pyriform; husk thin and tardily dehiscent; nut 

 quite smooth and thick-shelled PIG-NUT HICKORY (H. ylabra) . 



