250 



SYSTEMATIC BOTANY. 



Fig. 365. 



Fig. 367. 



Fig. 366. 

 o 



Fig. 368. 



Fig. 365. Inflorescence, calyx, corolla, &c., of Bean. 



Fig. 366. Ground-plan of a Papilionaceous flower the bracket represents the position of 



the bract, the O that of the axis. 

 Fig. 367. Diadelphous stamens of Leguminosae. 

 Fig. 368. Stipitate ovary, style, and stigma of Colutea. 



This large Order is divided into three Suborders, which are dis- 

 tinguished by the following characters : 



1. PAPILIOKACE^E. Corolla papilionaceous, imbricated in the 

 bud, with the upper, odd petal, called the standard or 

 " vexillum," exterior. 2. C^SALPINIE^E. Corolla imbricated 

 in aestivation, the odd petal with its edges inside the lateral 

 ones. 3. MIMOSE^E. Corolla valvate in aestivation. 



The typical floral formula is |8 5, P5, A 5 + 5, Grl, but much 

 variation from it occurs. 



This vast Order is further subdivided into several tribes, the 

 subdivisions being founded on the degree of cohesion of the sta- 

 mens, the nature of the pod and cotyledons, the leaves, habit, &c. 



Chorozema, Labill. 

 Lupinus, L. 

 Lotus, L. 

 Trifolium, L. 



ILLUSTBATIVE GENERA. 

 1. PAPILIONACEJE. 



Astralagus, L. 

 Pisum, L. 

 Arachis, L. 

 Ornithopus, L. 



Phaseolus, L. 

 Dalbergia, L. 

 Sophora, L. 

 Swartzia, Willd. 



