352 



COLLEGE BOTANY 



united ; asymmetrical ; petals five, usually more or less united, 

 asymmetrical; stamens ten (sometimes five), monadelptous, 

 diadelp'hous (or rarely distinct) ; pistil of one carpel and supe- 

 rior ; ovary single. A very large family, containing many of our 

 most valuable agricultural plants (Fig. 194). 



Fig. 191. — Strawberry. 



The common garden pea (Pisum sativum), of which there 

 are many varieties, is well known and may be considered a type 

 of the family. The origin of the pea is not definitely known, but 

 it is extensively cultivated throughout a considerable part of the 

 sub-tropical and temperate zones. The field pea (P- arvense), 

 which is most important as a st<K;k food, grows wild in Italy. 



