Trees of the Xorthekx I'xitkd States •""57 



A. Upper petal inclosed by the lateral ones in the 



bud; leaves simple or compound mostly with 

 stipules. Cassiatae. 

 a. Leaves simple, llowers l)isporan.u:iate. 



Cercis. (20). 



a. Leaves compound, tknvcrs diecious (jr imper- 



fecta^ diecious'. b. 



b. Stamens 3-5; pitli small; usually with 



thorns. Gleditsia. (:'.<•). 

 b. Stamens 10; pitli lar.cfc, chocolate-colored; 

 without thorns. Gymnocladus. CM). 



B. Upper petal inclosing the lateral ones in the bud; 



leaves compound (sometimes with 1 leaflet) 

 with stipules. Faratae. 

 a. Without stipular spines; leaflets large. 3-6 in. 

 long; base of peti<^lc covering the axillary 

 buds like a cap. Cladrastis. ('A-1). 

 a. With stipular spines; leaflets small. 1-2 in. 

 long; base of petiole not covering the 

 axillary' buds like a cap, but solid. 



Robinia. (:«). 

 1'). Carpels more than 1 as shown b}- the C(nnpound 

 ovulary, cavities, placentae, styles, or stigmas. 16. 

 1(». Ovulary 2-locular to pluriocular. 17. 

 l(i. Ovulary 1-locular, ovules solitary, stigmas '■^\ shrubs 

 or trees with resinous or milky sap and alternate 

 leaves without stipules. ANArARDiACEAE. 

 a. Leaves compound; style terminal, b. 



a. Leaves simple: style lateral. Cotinus. (44) 



1). F^etiole base covering the axillary buds, or if not 

 then the rachis wing-margi)ied; not poisonous. 



Rhus. (42). 



b. I'etinlc base not completely covering the axillary 



buds, the rachis not wing-margined; poisonous 

 tn the touch; glabrous; leaflets entire. 



Toxicodendron. (I'.) 

 17. I'Imw-.ts reguhir or nearly so. h"^. 



17. I'M'nvers irregular; <hrubs or trees with oppo.->ite 

 digitite leaxe-: .>\n!arv •■>-h>ctilar. .\Ksrri..vrE.\E. 



