l ord » 
i) 
BIG SPRING PRAIRIE. 
quefolia (Virginia Creeper); Rhus radicans (Poison Ivy); 
Staphylea trifolia (Bladdernut); Sambucus canadensis 
(Elderberry); Lonicera (sp?) (Honeysuckle); Spiraea 
(sp?); Viburnum (two species) (Arrow wood); Malus 
coronaria (American Crab-apple); Salix (several spe- 
cies) (Willows); Populus deltoides (Cotton wood); Pop- 
ulus tremuloides (Trembling Aspen); and Cornus flori- 
da (Flowering Dogwood). In all there are twenty-five 
or more species, some forming a sort of zone along the 
edge of forest. 
On West Dune only the following eight shrubs and 
young trees were observed: 
Euonymus atropurpureus (Wahoo); Euonymus 
obovatus (Running Strawberry); Viburnum prunifolium 
(Black Haw); Rubus villosus (Common Blackberry); 
Cornus stolonifera (Osier); Parthenocissus quinquefolia 
(Virginia Creeper); Vitis sp? (Wild Grape); Populus 
tremuloides (Trembling Aspen. ) 
The Dune Complex, being richer in genera and 
species, indicates conclusively its priority in formation. 
Perhaps the West Dune was formed when there was 
only a lake remnant, and there was not the same op- 
portunity for the transportation of suitable seeds by 
water currents, as there was in the case of the Dune 
Complex. It would also indicate that the seeds were 
introduced upon the Dune Complex by water currents 
rather than by wind dispersal, or else the disparity in 
number of genera and species upon these two dune 
areas would not be so great, as they are only a short 
distance apart. 
If the prevailing westerly winds were the chief 
factor in the introduction of new species in this region, 
the West Dune ought to be much richer in species than 
it is, as for many years past, it must have intercepted 
the seeds from this source. Perhaps this accounts for 
the greater abundance of Cottonwoods on the West 
Dune. 
