GEOGRAPHY OF CENTRAL FLORIDA 199 



illustrations, which tell many things that cannot be put in words. 

 The principal vegetation types seem to be as follows : 



PLACES WITH NO VEGETATION 



These include bodies of water too deep for seeds to germinate 

 in, caves too dark, small rock outcrops in piiie woods swept by fire, 

 beaches continually washed by waves, and roads, fields, and other 

 artificial situations. 



HERBS PREDOMINATING 



Aquatic vegetation (fig. 35). In the deeper parts of lakes and 

 in sluggish rivers and runs there are quite a number of herbs, either 

 floating free like the water-hyacinth (which however is not native) 

 and water lettuce, or with floati-ng leaves like the water-lilies and 

 bonnets, or all submerged except the flowers (species of ,Sagit- 

 taria, V aUisneria, Potamogeton, etc.) or with both leaves and flow- 

 ers raised above the water (Sagittaria lancifolia, Scirpus, Ponte- 

 deria, etc.). Such vegetation is found in fi-esh water that does not 

 vary too much in level, in all countries that are not too cold or too 

 dry, and consists mostly of monocotyledons and rather simple dico- 

 tyledons. It has much the same aspect in all continents, and the gen- 



Fig. 35. Marshy margin of Lake Apopka near West Apopka, Lake County, 

 showing water-lilies, wampee {Pontederia), etc. May 20, 1909. 



14 



