THE SPPvIXG FLORA 161 



the tree as a whole. Is their general distribution 

 and their individual attitude (due to tropistic 

 response) such as to facilitate the distribution of 

 seeds? Search for the seeds. What adaptation 

 have they for dissemination ? What is the plan 

 of arrangement of the cone scales on the cone 

 axis ? Does it correspond to the body plan of 

 the tree? 



(2) Young strobili. Do you find strobili of different ages 



on the pine ? Note the position of young strobili 

 How long does it take pine cones to mature ? 



(3) Staminate and ovulate strobili Do you find both 



staminate and ovulate strobili on the same tree? 

 The staminate cones can only be found in late 

 spring, since pollination occurs in pines about 

 the first of June. 



(4) Make simple sketches to illustrate the positions 



on the branches and the attitudes assumed by 

 strobili of different ages and kinds. 



ANGIOSPERMS (HARDWOOD TREES) 



FIELD STUDIES 

 1. Habitat. 



a. Local habitat. Study the conditions under which the 



species grows in the local habitat, including the soil, 



water supply, and drainage conditions. Which one 



of the following habitats does it occupy ? 



(1) MesopJiytic habitats. Does it live in typical upland 



mesophytic conditions or is it found on lowlands 



such as flood plains, river banks, and the borders 



of lakes and ponds ? Note that ornamental trees 



are frequently not growing in their natural habitat. 



