General Key to the Families 



Vll 

 PAGE 



Flowers perfect, or, if monoecious or dioecious, 

 not in dense heads. 

 Ovaries several, or, if but one, becoming 

 an achene in fruit. 

 Ovaries separate, rarely united with the 

 calyx; fruit achenes, follicles or drupe- 

 lets. 

 Ovaries united, enclosed by and united 

 with the hypanthium, forming a pome 

 in fruit. 

 Ovary one, not becoming an achene in fruit 

 Leaves simple; ovary with 2 ovules; fruit 



a drupe. 

 Leaves compound; ovary with several 

 or many ovules; fruit a legume. 

 Petals valvate in the bud. 

 Petals imbricated in the bud. 

 JJFlowers irregular. 

 L^pper petal enclosed by the lateral ones in 



the bud; corolla not papilionaceous. 

 Upper petal enclosing the lateral"T)nes in the 

 bud; corolla papilionaceous. 

 lltlOvary compound; sepals mostly sep- 

 arate (more or less united in some 

 of the Buckthorn Family). 

 Stamens few, rarely more than twice as 



many as the petals. 

 ||Stamens opposite the sepals and of the 

 same nimiber, or fewer; ovules pen- 

 dulous, or erect or ascending. 

 ^Ovules pendulous, the raphe toward 



the axis of the ovary. 

 "Petals present, usually as many as the 

 sepals; sap not acrid nor milky; leaves 

 mostly compound. 

 Plants without secreting glands; fruit, in our 



species, a dry capsule. 

 Plants with secreting glands, at least in the 

 bark; fruit various. 

 Filaments nearly or quite separate. 

 Leaves with pellucid dots. 

 Leaves without pellucid dots. 



Ovaries more or less united; leaves 

 pinnately compound. 

 Sap bitter. 



Sap resinous and aromatic. 

 Ovaries separate; leaves simple. 

 Filaments united into a tube. 

 Petals often wanting; sap acrid, usually 

 milky; leaves simple. 



Caltrop Fa^hly. 



Rue Family. 



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567 



