72 REPRESENTATIVE PLANTS 



Find out some facts about " spurges/' a great family of 

 plants with milky latex. 



18. The Salver Form of Gamopetalous Flowers of 

 THE Phlox Species (Polemoxium Family) 



The plants. Common and showy plants of many life 

 habits. Study them as they grow if you are able. What 

 common name is applied to many forms ? 



Flower. Examine a flowering branch for the character 

 and arrangement of the leaves and the form of the inflores- 

 cence. Study a single flower. What do you observe about 

 the calyx and the peculiar form of the corolla? Such a 

 form is said to be salver form. The long slender base is 

 the corolla tube, and the lobed, expanded part of the flower 

 is the lijnb. Is the flower with petals separate or united ? 

 Is there any evidence of odor ? Do all the flowers of a 

 corymb open at once or are there some buds and blossoms? 

 Seek for the stamens. Where are they borne and how many 

 are there ? Where are the anthers with reference to the 

 stigma? Examine the pistil. Is the ovary superior or 

 inferior? How many styles are there? 



Draw a flower on its peduncle to show both calyx and 

 corolla. Make a drawing showing position of stamens. 

 Draw a flower plan. Draw a pistil. 



Pollination, etc. What scheme of pollination does the 

 phlox have ? Of what importance is the genus as a garden 

 flower ? What does " phlox " mean ? 



Flowers with long tubes. Name as many flowers as 

 you know with long corolla tubes. What insects visit 

 such flowers ? What mouth parts would be necessary 

 with such forms ? Correlate the sucking tongue of a but- 

 terfly, inserted into the tube, with the position of anther 

 and sticrma. 



