1892.] A Pecuiiar Case of Plant Dissemination. 323 
We would find there Plantago (2 species), Asclepias Syri- 
aca, Trifolium, Thlaspi, Amarantus, Chenopodium album, Mar- 
tynia proboscidea, Sinapis, Portulaca, Lippia cuneifolia, and 
the grasses, such as Cenchrus, Stipa, Setaria, Elymus, Dac- 
tylis, Deschampsia, Panicum Crus-galli, Euphorbia, Glycyr- 
thiza, Epilobium. 
We could add to this list Helianthus, but as this plant is 
firmly established as a native to the soil of this whole region, 
and universally appears along old roads and inall the valleys, 
its dissemination seems to be largely independent of artificial 
dissemination, and dependent for its spread solely on the 
bared condition of the ground when sodless. We have so far 
given what annuals or biennials are found in the artificial de- 
nudations made by the buffalo. To these we can add Rhus 
tado, at the foot of our Rocky Mountains, has been intro- 
duced since 1860; and found in Wyoming as far north as the 
forty-second parallel: the plum might be, perhaps, the Prun- 
Mus pumila, but may be only a variety of P. Chicasa, though I 
can hardly admit this as probable. 
mud, seeds, twigs cactus fronds and roots. 
N examining the heads of dead buffalo I repeatedly 
gg The pad altogether made up an ambulant Wardian 
