44 UNIVERSITY OF MISSOURI STUDIES [192 



thoroughly naturalized, b. Weeds (Ruderales). c. Cul- 

 tural and ornamental plants that have escaped (Fugitivae). 



a. Faenales. Most of the common forage grasses and 

 clovers have become thoroughly established about Boulder. 

 I have noted the following: 



Phleum pratense Festuca elatior 



Agrostis alba Lolium Italicum 



Dactylis glomerata Tri folium pratense 



Poa pratensis T. repens 



P. compressa T. hybridum 



P. trivialis Medica sativa 



b. Ruderales. In the appended list of weeds only those 

 that have been introduced from elsewhere, or, if native, are 

 also common weeds in many parts of the United States, have 

 been included. However, many native species, such as the 

 various gum-weeds and spurges, must often be bad weeds in 

 cultivated grounds. But to do justice to the ruderal aspects 

 of the native flora would require much special study, such as 

 one is unable to make in the course of a few weeks, and es- 

 pecially one who is unfamiliar with agriculture as carried on 

 in Colorado. I noted the following weeds : 



Syntherisma sanguinale B. secalinus 



Panicum capillare B. hordeaceus 



Echinochloa Crus-galli B. tectorum 



Chaetochloa glauca Rumex Acetosella 



C. viridis R. crispus 



Cenchrus Carolinianus R. obtusifolius 



Avena fatua Polygonum erectum 



Eragrostis major P. aviculare 



Poa annua Persicaria Persicaria 



Bromus brizaeformis Tiniaria Convolvulus 



