17 

 19. Heredity. 



The grass and sedge forra, (elongation, verticality, narrowness) 

 typical of a marsh plant. 



Red Algae grow lowermost, green next, and brown nearest shore. 

 Water lily shows red on lower surface. Q,uestion of color. Pn.c-as 

 a xerophytic plant, reseml^ling salt marsh plants. 



Meaning of leaf form. 

 Surface, expanse, and shape. 



Best examples of expanded leaf in floating leaves, (water lily) ^ 

 shade plants (Impatiens), and suhmerged marine plants. Many alsc 

 grow in sunlight, as rosette plants, and many trees, sycamore, 

 linden, and catalpa. 



Rediiced expansion, compound and grass forms. Ecologically 

 locust is a sraall-leaved form. 



Suhmerged forms, examples as deeper Algae, grasses, desert 

 plants, willows, pines, locust or divided leaves, shade plants as 

 mosses. Arctic plants. Ferns. 



The expanded leaf is more favorahle to the individual, the 

 compound to the plant as a whole. The divided leaf is the best 

 where there is great need for economy. 



In the shade leaves tend to grow larger. In the linden, 

 leaves in the shade are larger and thinner than those in the sun 

 but both sweem to have about the same amount of chlorophyll. 

 Those at the top have need of less transpiration, hence another 



