198 



SPECIAL EXERCISES ON TYPICAL FLOWERS 



Make drawings as follows : 



1. The entire plant. 



2. The plan of the flower. 



3. A sepal, a petal, a stamen, and the pistil X 3. 



171. THE IRIS 



Blue flag is common along streams and marshes and fleur- 

 de-lis is abundant in gardens. Most of these flowers are to 

 be had only in spring, but the Tigridias may be cultivated in 



gardens late in the 

 summer. 



Method (Field). - 

 Study the plants in 

 the field, noting the 

 erect habit of growth, 

 shape, and position 

 of leaf, character of 

 the soil where they 

 grow. Procure an 

 underground part and 

 examine it. Is it root 

 or stem ? Reason for 

 your answer. Draw. 

 Note the way in 

 which the leaves over- 

 lap (equitant). Do these plants in general occupy any defi- 

 nite position with reference to the sun; that is, are they 

 in any way what are known as compass plants? If so, 

 account for it. 



Method (Laboratory). Study a bud. How do the floral 

 organs overlap in the bud ? Draw. Study a flower. How 

 many floral circles can you find? 



FIG. 87. Iris. 

 (Photographed by W. C. Barbour.) 



