CLASSIFICATION OF ANGIOSPERMS. 635 



FlG. 343. Evening Primrose (CEnothera biennis), a simple, sometimes more or less 

 branching herb growing to a height of 3 to 15 dm. The leaves are lanceolate or oblong- 

 lanceolate; the flowers are symmetrical, with yellow petals; and the capsules are narrow 

 and 4-valved. This plant is one of the commonest of the CEnotheras, growing in open places. 

 It is a biennial like the other species, but it is possible for horticulturists to develop its life 

 history in one year. After_Brown. 



