THE PEA FAMILY. 177 



XXV. THE PEA FAMILY. LEGUMINOS^. 



MATERIAL REQUIRED. 



Entire specimens of the wild lupine, Lupinus perennis, L., in flower. 

 Flowers, leaves, and fruits of some or all of the following species : 

 RoUnia Pseudacacia, L. ; Vicia Caroliniana, Walt. ; Trifolium pra- 

 tense, L. ; Melilotm alba, Lam. ; Lathyrus palustris, L. ; Lathyrus 

 odoratus, L. 



WILD LUPINE. Lupinus perennis, L. 



Distribution and General Characters. 



Note locality and habits. Is this species indigenous or 

 introduced ? Describe in detail stem, leaf, and inflo- 

 rescence. 



Flower. 



I. How many divisions has the calyx? Is its surface 

 smooth or hairy ? 



II. With a number of good specimens at hand, observe 

 in their natural position the parts of the corolla, their 

 form, color, and relations to each other. They have 

 received special names that must be made familiar. The 

 conspicuous upper petal is called the standard, vexillum, 

 the two lateral ones are the wings, alee, while the two lower 

 ones are united to form the keel, carina. 



III. Examine critically each of these parts. 



1. Are there any grooves or ridges on the standard? If 

 so notice their form and direction. See if there 



