The floral diagram represents which one of the following families?   

The floral diagram given is that of the Brassicaceae family. The characteristic feature include the presence of four sepals arranged in imbricate aestivation. Six stamens are arranged in two whorls, of which two outer stamens are small (antisepalous) and four inner stamens are long (antipetalous). This condition is known as tetradynamous. 
(1) The floral diagram of Fabaceae family is given below.

(3) The floral diagram of Solanaceae family is as follows.

(4) The floral diagram of Liliaceae family is as follows.