CLASSIFICATION OF DICOTYLEDONS. 



191 



characterized by having the parts of the flowers in twos or 

 fours, so that they are more or less distinctly cross-shaped, 

 whence the name Cruciftorce. 



There are four families, of which the first is the poppy 

 family (Papaveracece) , including the poppies, eschscholtzias, 

 Mexican or prickly poppy (Argemone), etc., of the gardens, 



O- 



FIG. 103. Types of Aphanocyclse (Rhwadinse) . A, plant of blood-root, 

 Sanyuinaria (Papaveracese) , x y 3 . B, a single flower, x l. C, fruit, x %. 

 D, section of the seed. em. embryo, x 2. E, diagram of the flower. F, 

 flower of Dutchman's breeches, Dicentra (Fumariacese) , x 1. G, group of 

 three stamens of the same, x 2. H, one of the inner petals, x 2. /, fruit of 

 celandine poppy, Stylophorum (Papaveracese) , x %. J, flower of mustard, 

 Brassica (Cruciferze) , x 1. K, the same, with the petals removed, x 2. 

 L, fruit of the same, x 1. 



and the blood-root (Sanguinaria), celandine poppy (Stylo- 

 phorum), and a few other wild plants (see Fig. 103, A-I). 

 Most of the family have a colored juice (latex), which is white 

 in the poppy, yellow in celandine and Argemone, and orange- 

 red in the blood-root. From the latex of the opium poppy the 

 opium of commerce is extracted. 



