DICOTYLEDONS: RO SALES. 683 



here because of the position and form in the flower. At fig. 



572 the petals are separated and shown 



in their corresponding positions, and the 



names are there given. The flower is 



irregular and the parts are in fives, except 



the carpel, which is single. The calyx is 



gamosepalous (coherent), the corolla poly- 



petalous (distinct). The ten stamens are in 



two groups, one separate stamen and nine 



united; they are thus diadelphous (two 



brotherhoods). The fruit forms a pod or Fig. 572. 



,. , Corolla of pea. S.stand- 



legume, and at maturity splits along both ard, w, wings; K, two 



' petals forming keel. 



edges. 



There are three families in the legume-bearing plants: ist, 

 including the locusts, cassias, etc. ; 2d, the pea family, including 

 peas, beans, clovers, ground-nuts, or peanuts, vetches, des- 

 modium, etc.; 3d, including the sensitive plants like mimosa. 



SUGGESTIONS FOR STUDY OF THE PEA. 



1175. The pea (Pisum sativum). 



The entire plant. Describe the entire plant, the branching, the means 

 for support (compare different cultivated varieties in respect to size, habit, 

 and means for support if practicable). 



The leaf. Sketch a leaf; name the different parts; what kind of a 

 leaf is it? Does the leaf serve any purpose for the mechanical support of 

 the plant? How? 



The inflorescence. What is the kind of inflorescence? 



The flower. Is it regular or irregular ? 



The calyx. Describe the calyx. How many sepals are indicated ? Are 

 the sepals distinct or coherent? What name is applied to this kind of 

 a calyx ? 



The corolla. What are the relations of the petals to each other? What 

 term is applied to indicate this relation? Sketch a flower, and name the 

 different parts of the corolla; what name is given to such a flower? 



The stamens (remove the corolla). How many stamens are there? What 

 is their relation to each other? What terms are used to indicate such a 

 relation of stamens of each other? 



The pistil. How many carpels in the pistil ? Is it simple or compound ? 

 Sketch a young pistil, naming the parts. 



