90 



PLAN OF THE FLOWER. 



[lesson 13. 



(Fig. 176, 177) ; when the flowers are said to be dicedous (from two 

 Greek words meaning in two households). Or the two may occur 



on the same plant 



or the same stem, 



as in the Oak, 



Walnut, Nettle, 



and the Castor-oil 



Plant (Fig. 178); 



when the flowers 



are said to b^ mo- 



ncecious (that is, in one household). A flower 



may, however, be perfect, that is, have both 



stamens and pistils, and yet be incomplete. 



242. Incomplete Flowers are those in which 

 one or both sorts of the floral envelopes, or 

 leaves of the blossom, are wanting. Some- 

 times only one sort is wanting, as in the 

 Castor-oil Plant (Fig. 178) and in the Anem- 

 one (Fig. 179). In this case the missing 

 sort is always supposed to be the inner, that is, the corolla ; and 

 accordingly such flowers are said to be apetahus (meaning without 

 petals). Occasionally both the corolla and the calyx are wanting, 

 when the flower has no proper cover- 

 ings or floral envelopes at all. It is then 

 said to be naked, as in the Lizard's- 

 tail (Fig. 180), and in the "Willow. 



243. Our two pattern flowers (Fig. 

 168, 174) are regular and symmetrical 

 (239). We commonly 

 expect this to be the 

 case in living things. 

 The corresponding 



parts of plants, like the limbs or members of ani- 

 mals, are generally alike, and the whole arrange- 

 ment is symmetrical. This symmeti-y pervades 

 the blossom, especially. But the student may often fail to perceive 



■ FIG. 178. Monfflcious flonrers, i. o. one staminate (s) and one pistillate (p) flower of 

 the Castor-oil Plant, growing on tile same gtem. 



FfG. 179. ApetalouB (incomplete) flower of Anemone Pennsylvanioa. 



FIG. 180. A naked (but perfect) flower of the Liaard's-tail. 



