138 



BEGIXXERS' BOTANY 



^^-- 



gourd, pumpkin, the plant is monoecious ("in one house"). 



When they are on different plants, e.g. poplar, cottonwood, 



bois d'arc, willow (Fig. 182), 

 the plant is dioecious ("in two 

 houses "). Some varieties of 

 strawberry, grape, and mul- 

 berry are partly dicecious. Is 

 the rose either monoecious 

 or dioecious .'' 



Flowers in which the parts 

 of each series are alike are 

 said to be regular (as in Figs. 

 173. 174, 175)- Those in 

 which some parts are unlike 

 other parts of the same series 



are irregular. Their regularity may be in calyx, as in 



nasturtium (Fig. 183); in corolla (Figs. 1S4, 185); in the 

 (X \\ stamens (compare nasturtium, catnip, 



Fig. 185, sage); in the pistils. Irregu- 

 r \ larity is most frequent in the corolla. 



Fig. 182. — Catkins of a Willow. 



A staminate flower is shown at j, and a 

 pistillate flower at /. The staminate 

 and pistillate are on different plants. 



Fig. 183.— Flower of 

 Garden Nasturtium. 



Separate petal at a. The 

 calyx is produced into a 

 spur. 



FIG. 1S4. — The Five Petals 

 OF THE P\NbV, detached to 

 show the form. 



