A GUIDE TO THE WILD FLOWERS 



195 



like, 2 lateral ones wing-like, and the other 2 more, or less 

 united into a keel. A common example is the sweet-pea, but 

 sometimes the flowers are smaller and crowded into tight 

 clusters like the clover. Fruit a legume, of which the garden 

 pea is a typical illustration. Sometimes the pods are shorter 

 than in the pea. The family is often called Papilionaccae 

 (Papilio — ^butterfly, from the resemblance of the flower to a 

 butterfly). For the vines of this family see Nos. 216-234. 

 Of the scores of species known in the area, the following 

 may be separated thus: 



Leaflets 3 no. 596 



Leaflets i Rattle-box no. 593 



Leaflets more than 5 

 Leaflets arranged finger-fashion; flowers blue . .. .Lupine no. 594 



Leaflets arranged feather-fashion ; flowers yellow-purple 



Wild Sweet-pea no. 595 



593. Rattle-box Crofalaria sagittalis. An annual low weed, 

 softly hairy, rarely over 10 in. high. Leaflets i (appearing as 

 though with simple leaves, but actually compound and re- 

 stricted to I leaflet), almost stalkless, oval, or oblong-oval, 

 pointed both ends, about i^ in. long. Flowers yellow, the 

 sepals long-pointed and hairy. Pod smooth, black, inflated 

 when ripe, so that the shining seeds rattle in a cavity too 

 big for them. In dry places. Vermont to Florida, and west- 

 ward. July-August. Fig. 593. 



594. Lupine. Lupinus pcrcnnis. A hairy perennial of dry 

 soil, 1-2 ft. tall with compound leaves, the 7-1 1 leaflets ar- 



