216 



SYSTEMATIC BOTANY. 



3. R. TOXICODENDRON (Poison Oak, Poison Ivy}. Stem erect, or de- 

 cumbent ; leaves pubescent, ternate ; leaflets broad oval ; flowers green, in 

 racemose panicles ; drupes sub-globose, smooth, pale brown. A low shrub 

 1-3 feet high, poisonous, but less so than the last. 



SUPERIOR POLYPETALOUS EXOGENS. 

 Order XXVII. LEGUMINOS^: (Pea Family]. 



Herbs, shrubs, or trees. Leaves alternate, often compoundc 

 Stipules present. Calyx consisting usually of 5, more or less 

 united sepals. Petals 5, either papilionaceous or regular. Sta- 

 mens perigynous, sometimes hypogynous, diadelphous, mona- 

 delphous, or distinct. Ovary single, and simple. Fruit a le- 

 gume, assuming various forms, sometimes divided into several 

 I -seeded joints, when it is called a loment. Seeds solitary, or 

 several, destitute of albumen. A very large and important or- 

 der, distributed throughout the world, except in Arctic coun- 

 tries. 



C Style bearded, next to free stamen 

 ' Leaves abruptly [ Lathyrus. 



pinnate, tendriled \ 



Style bearded, opposite to free stamen 

 Pisunt. 



Flowers 

 papili- 

 onaceous 



Leaves 

 unequally 

 pinnate 



Stems ("Woody, bluish flowers Wistaria. 



twining -I 



[ Herbs, purplish flowers Apios. 



Stems not f Trees or shrubs Robinia. 

 twining -I 



[ Herbs Tephrosia. 



f Legume linear, many-seed- 

 ed Phaseolus. 



Leaves pinnately 

 3-foliolate 



Leaves palmately 

 3-foliolate 



Flowers not papilionaceous 



Calyx cam- 

 pan ulate 



Legume flat, few-seeded 

 [ Amphicarpiza. 



(Legume of hispid joints 

 Desmodium. 

 Legume not jointed, small 

 Melilotus. 



f Pod small, included in calyx Trifolium. 



Pod curved or coiled Medicago. 



Pod lenticular, flat, i-seeded Lespedeza. 

 [Pod inflated, 2-seeded Baptisia. 

 ( Herbs Ca ssia. 



