LODGEPOLE-PINE FORESTS OF BOULDER PARK 275 



Forest fires at various times have burned over greater or smaller 

 areas of the hillsides surrounding the park. 



In the close formation the growing season for plants of the forest 

 floor is very short and the vegetation consists purely of shrubs. The 

 principal plants are blueberry, rose and kinnikinic. The aspect 

 of the forest floor remains much the same throughout the growing 

 period. 



In the open formation flowering herbs are the principal species, 

 so the aspect of the floor changes according to the season. The 

 appearance of societies of Pulsatilla, Thermopsis, Anemone, Aragallus, 

 Pentstemon, Castilleja, Chamaenerion, Solidago and Erigeron mark 

 the various seasons. 



In the course of the present study sixty-two species of flowering 

 herbs, thirteen species of grasses, twelve species of shrubs and nine 

 species of trees were noted. 



Note. — The above study was undertaken at the suggestion of Professor Francis 

 Ramaley while the writer was a student at the University of Colorado Mountain 

 Laboratory in the summer of 1909. Additional observations were made at the 

 second session of the laboratory (19 10). The ecological terminology used is 

 essentially that presented in the lectures at the laboratory and since published 

 in outline form by Professor Ramaley in a paper entitled "Remarks on some 

 Northern Colorado Plant Communities with Special Reference to Boulder Park 

 (Tolland, Colorado)," in University oj Colorado Studies, Vol, VII, pp. 223-236, 

 July, 1910. 



