LABIATE AND LILY FLOWERS 



145 



244. Flower of trillium. 



294. Labiate gamopetalous 

 flowers which are closed in 

 the throat (or entrance to the 

 tube) are said to be grinning 

 or personate (personate means 

 masked, or person-like). Snap- 

 dragon is a typical example 

 (Fig. 243); also toad-flax or 

 butter and eggs (Fig. 227), and 

 many related plants. Personate 

 flowers usually have definite 

 relations to insect pollination. 

 Observe how a bee forces his 



head into the closed throat of the toad-flax. 

 295. Lily Flowers. — In 



plants of the lily family (Lili- 



acese) the flowers are typically 



3-merous, having three sepals, 



three petals, six stamens and 



a 3-carpelled pistil. The 



parts in the different series 



are distinct from each other 



(excepting the carpels), and 



mostly free from other series. 



The sepals and petals are so 



much alike that they are dis- 

 tinguished chiefly by position, 



and for this reason the words 



calyx and corolla are not 



used, but the floral envelope is 



called the 'perianth and the 



parts are segments. Flowers of 



lilies and trilliums (Fig. 244) 



answer these details. Not all 



flowers in the lily family 



245. Papilionaceous flowers. — 

 Sweet pea. 



