152 
In some of the palm groves the cabbage-trees served as gr 
arbors for vines of grape (Vitis), Virginia-creeper (Partheno- 
n couple i 
speculation. These banks of sand exhibited methods of seed 
dispersal by animals, both birds on mammals, and also by air 
currents, ina For example, 
we found the silver-palm (Coccothrinax rae planted by 
bank 
River. Now, the vegetation of the canal embankments has come 
there since the banks were thrown up about 1908. Of cones to 
begin with they were barren piles of sand. Within 
yy few years they have become clothed with herbs, shrubs, and 
The silver-palm is on the embankments and maar 
the natural development of this tender palm, but th ering 
effect of the canal, lagoons, and marshes, although slight, may 
e sufficient to en e palm growing directly on the banks 
banks, but it has been derived rom the immediate region. 
invasion of southern palms extends almost up to Lake Worth. 
