30 L. Lesquereux on the Origin and Formation of Prairies. 
brought from somewhere far away. For the vegetation of the 
th 
s 
rents, etc., than those of Pentalostemon, Astragalus, Baptisia, 
other Leguminosz so common on the prairies? The vege- 
tation of the prairies has the same general character as that of 
the swamps and marsh lands. In both there js especially an 
abundance of large, coarse Composit, “plants which continu- 
ally pump water by their roots from the soil and send it through 
i ™® These and most 
* According to Prof. Winchell’s opinion, This Journal, 2], iii, 344, 
** De Candolle Physiol. Veget., p. 1210. pete woke 
