393 
Heller, K. purpurea (Vent.) MacM., Amorpha canescens Pursh, 
Parosela aurea (Nutt.) Britt., Solidago Missouriensis Nutt., Helian- 
thus mollis Lam., Hieracium longipillum Torr. The fact is signifi- 
cant that of the 175 species collected, 33 were Leguminosae and 
32 were Compositae. Sadbdbatia angularis (1..) Pursh, S. campes- 
tris Nutt. and Buechnera Americana L. give bright colors to the 
Prairies during June and July; Linum sulcatum Riddell, Ceanothus 
Americanus L.., Jatropha stimulosa Michx., Euphorbia corollata L., E. 
petaloidea Eng., E. marginata Pursh, occur on the richer prairies, 
while Megapterium Missouriensis (Sims) Spach, Houstonta anguste- 
Solia Mx., Stenosiphon linifolium (Nutt.) Britton, Opuntia poly- 
acantha Haw., and Gerardia densiora Benth., are found on dry 
sterile prairies. A very severe case of poisoning was incurred from 
collecting Euphorbia corollata. 
A very paradise for a collector of aquatic vegetation is a large 
Pond near Perkins, Oklahoma. Several Sagittarias, Nelwmdo lutea 
Pers,, Potamogeton lonchites Tuckerm., the latter growing “rarely 
in ponds” (Gray’s Man.), P. diverstfolius Raf., are most abundant 
throughout, while near the edges Heteranthera limosa (Sw.) Willd., 
Ludwigia glandulosa Walt., Monniera rotundifolia Mx., and Mar- 
silia vestita Hook. & Grev. grow rank. Some of the specimens of 
this Marsilia growing both in and along the banks of the pond 
have petioles 7-8’ long, the type being reported in the Manuals 
1-4’. Dr. Underwood, however, pronounces this undoubtedly 
MM. vestita, 
As suggested above, the special interest of this region lies in 
the fact of the meeting of two floras and the sometimes abrupt, 
-S€nerally gradual, transition of one into the other. The flora can- 
not be studied comprehensively except by an extended period of 
field work and by carefully noting all the environmental conditions. 
The farther west one goes into the territory the more sandy and 
desert the regions become; and such are the variations from some of 
the more eastern forms that many are classed as varieties, no 
doubt the result of a change in habitat. According to Mr. 
Coville’s suggestions in his “ Botany of Death Valley Expedition,” 
the shrubs and trees and on the prairies the perennials should 
age be noted to determine the characteristic plants of the 
ora, 
