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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 

 Agrostis alba 

 Dactylis glomerata 

 Poa pratensis 

 P. compressa 

 P. trivialis 



Festuca elatior 

 Lolium Italicum 

 Tri folium pratense 

 T. repens 

 T. hybridura 

 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 

 Echinochloa Crus-galli 

 Chaetochloa glauca 

 C. viridis 



Cenchrus Carolinianus 

 Avena fatua 

 Eragrostis major 

 Poa annua 

 Bromus brizaeformis 



B. hordeaceus 

 B. tectorum 

 Rumex Acetosella 

 R. crispus 

 R. obtusifolius 

 Polygonum erectum 

 P. aviculare 

 Persicaria Persicaria 

 Tiniaria Convolvulus 



