495 
troduced species recorded seems large when it is remembered 
that Colorado was not explored until the early years of the 
nineteenth century and that permanent settlements are scar- 
cely 60 years old. 
List of species. In the following list only a few notes as to 
the better-known facts of distribution are given for each species. 
The arrangement is that of the Enener and Pranri-system. 
Gramineae. 
Syntherisna humifusum (Pers.) Rydb. (Panicum lineare Crock.) 
Plains area and foothill zone. 
Syntherisma sanguinale (Li.) Dulac. (Panicum sanguinale L.) 
Plains area. 
Fichinochloa crus-ygalli (.) Beauv. (Panicum crus-galli 1.) 
Common and widely distibuted in the plains area and foot- 
hill zone; occasionally in the montane zone. 
Chaetochloa glauca (.) Scrib. (Se¢aria glauca Beauv.) 
Common; plains area. 
Chaetochloa viridis (L.) Serib. (Setaria viridis Beauv.) 
Common in plains area; often in foothill zone. 
Chaetochloa italica (l.) Scrib. (Se¢aria italica Kunth.) 
Escaped from cultivation; plains area. 
Phalaris canariensis L. 
Plains area and foothill zone. 
Polypogon monspeliensis (L.) Desf. 
Occasional in the plains area. 
Avena fatua L. 
Along roadsides; not common. 
Kragrostis major Host. 
Plains area. 
Dactylis glomerata L. 
Kscaped from cultivation in lawns and pastures; plains to 
montane zone. 
Briza maxima L. 
Escaped from cultivation; an ornamental grass. 
