76 Rhodora [APRIL 
Pinguicula. The North American species are confined to the 
glaciated region and to the pine-barrens from North Carolina south- 
westward, but none are common to the two regions. 
Utricularia inflata, Walt. South to Florida, West Tennessee, and 
Texas. 
Utricularia purpurea, Walt. West to northern Indiana, south to 
Florida and Alabama. 
Utricularia resupinata, B. D. Greene. West to Michigan and 
northern Indiana. Also in the pine-barrens of Georgia and Florida, 
but not yet reported from intermediate stations. 
Utricularia cornuta, Mx. West to Minnesota, south to Florida 
and Louisiana. (Not reported from Alabama or Tennessee.) In 
Georgia confined to the pine-barrens. 
Utricularia subulata, L. South to Florida, Arkansas, and Texas. 
Also in the tropics. 
Eupatorium verbenaefolium, Mx. South to Florida and Louisiana 
in the coastal plain. Also in East Tennessee (Gattinger) and Pike 
County, Middle Georgia." 
It will be noticed by persons familiar with the above-mentioned 
plants that they all grow either in or around ponds, in wet meadows, 
or in sandy or sphagnous bogs; but many of them exhibit what 
ecologists term xerophytic structures. (The explanation of this 
apparent anomaly of structure is usually sought in the properties of 
the soil, but it would seem that illumination has just as much to do 
with it, for with few exceptions they are sun-loving plants). And as 
Dr. Hollick noted in the case of the northern “pine-barren ” plants, 
they are nearly all endemic to eastern North America. 
No mention has been made of weeds, for their distribution is so 
erratic as to be of little significance in this connection; or of plants 
of salt marshes and dunes, for they occur along the coast in almost 
any part of the world, regardless of whether a coastal plain is 
present or not. 
In the case of the true aquatics in the above list their distribution 
is easily accounted for by the fact that there are no natural ponds in 
the Blue Ridge and Piedmont region, the two principal pond-forming 
agencies, glaciers and limestone, never having been present in those 
parts. (Even in the middle of the coastal plain of Georgia there is 
! See Bull. Torr. Bot. Club, 30: 294. 1903. 
