INTERDEPENDENCE OF ORGANISMS 15 



Materials needed : Flowers of ten or more species (pref- 

 erably native) , in sufficient abundance so that all stages of 

 flowering from the bud to withering can be found. They 

 must be fresh: if wilted when brought in, they may be re- 

 vived by being placed under a bell jar with water for a time. 



The student will need so to familiarize himself with the 

 parts of the flower as to be able to recognize them under all 

 their disguises. Whatever their form the pollen-bearing 

 parts are the stamens, and the stigmatic surface is upon the 

 pistil. These parts should be examined at first in fresh, 

 full blown, and old flowers of some species of good size in 

 order to determine the appearance of anther and stigma at 

 maturity. And the nectaries, which are in appearance 

 often hardly more than pellucid spots of greenish tissue with 

 minute droplets of nectar exuding from them, should at 

 the first be distinctly recognized. The commoner forms of 

 corolla and of flower cluster should be learned. The fore- 

 going figures may be supplemented by those in any good 

 text book of botany. 



Tabulation of observations. — A sheet of paper ruled in 

 tabular form should be prepared with the following column 

 headings (abbreviated as desired) : 



Nam.e of plant. 



Order (or family) to which it belongs. 



Form of flower cluster (fig. 9). 



Parts of flower that are colored (white is a color, and 

 green is not, in botany). 



What colors. 



"Guide marks," indicating the entrance to the nectaries. 



Odor, its strength, character, etc. 

 fform (fig. 7). 



Corolla J symmetry, (radial or bilate^-al) . 

 I open or closed. 



