THE PEA TRIBE. 125 



are carefully folded over a boat-shaped curved part of 

 tlie corolla, which is placed in front of all the rest ; 

 this part, called the keeU or carina (Jigs. 2. & 3. c?.), 

 is formed of two petals, which are slightly united at 

 their lower edge, as you may discern by pulling the 

 keel away from the calyx, when you will see their 

 two stalks {fig. 4.) ; the corolla is, therefore, formed 

 of the same number of parts as the calyx, but so 

 masqued that you would not have at first suspected 

 such a thing. This is what is called a butterfly- 

 shaped flower ; some poetical Botanists having fan- 

 cied a resemblance between the expanded flower and 

 a butterfly at rest. 



Let us miss the stamens for the present, and pass 

 on to the ovary (^fig. 6.), w^hich is a tapering green 

 hairy part, gradually narrowing into a style which 

 ends in a minute stigma. Its legume is a short flat 

 body (fig. 7-)' ^^ which the withered style sticks. 

 When ripe it splits into two halves, to each of which 

 a seed or two {fig^ 8.) is attached. 



Papilionaceous flowers may be themselves separated 

 into those which have their stamens united, and those 

 which have their stamens separate. To the first belongs 

 the Restharrow ; which has nine of the stamens joined 

 together about half-way (^fig. 5.), and a tenth a little 

 separated from the others. It is here, also, that are 

 found nearly all those species of the Pea tribe with 

 which you arc likelv to be acquainted. Peas, Beans, 

 Vetches, Clover, Trefoil, and Lucerne, are known to 

 every body ; all these you can easily procure for 

 examination. Laburnum, too, with its branches of 



