118 FOUNDATIONS OP BOTANY 



papilionaceous or somewhat regular, in No. XV much reduced. 

 Stamens diadelphous (Fig. 16), monadelphous, or distinct. 

 Ovary simple, free from the calyx. Fruit usually a 1-celled 

 pod (Fig. 15). Seeds one or several, without endosperm. 



A. 



Flower regular, small. Stamens hypogynous. Leaves twice pinnate. 



Petals not united to each other. Stamens 5 or 10. Pod 

 smooth. Desmanthus, I. 



Corolla gamopetalous, 5-cleft. Stamens 8 or 10. Pod minutely 

 prickly or rough. Schrankia, II. 



B. 



Trees. Flowers somewhat or not at all papilionaceous ; sometimes almost 

 regular. The upper petal inside the others in the hud. Stamens 10 

 or less, usually not united to each other, borne on the calyx. 



Flowers imperfectly papilionaceous. Leaves simple. 



Cercis, III. 



Flowers not papilionaceous. Thornless. Gymnocladus, IV. 



Flowers not papilionaceous. Thorny. Gleditschia, V. 



C. 



Herbs or trees. Flowers decidedly papilionaceous. The upper petal 

 external in hud and enclosing the others. Stamens 10, not united to 

 each other. 



Trees. Cladrastis, VI. 



Herbs. Baptisia, VII. 

 D. 



Shrubs with a corolla of one petal' only. Amorpha, XV. 



E. 



Herbs, shrubs, or trees. Flowers decidedly papilionaceous. Stamens 

 monadelphous or diadelphous (in the latter case usually 9 and 1, as in 

 Fig. 15). 



