274 UNIVERSITY OF COLORADO STUDIES 



Secondary Species and Date of Greatest Abundance — Continued 



Antennaria rosea (D. C. Eaton) Greene. 



Antennaria microphylla Rydb 



Antennaria anaphaloides Rydb - 



Pentstemon glaucus stenosepalus A. Gray . 



Galium boreale L 



Campanula petiolata D. C 



Drymocallis glandulosa (Nutt.) Rydb... 



Frasera speciosa Dougl 



Geum strictum Ait 



Allium cernuum Roth 



Pyrola chlorantha Swartz 



July lo 

 July lo 

 July lo 

 July 15 

 July 15 

 July 15 

 July 1 8 

 July 14 

 July 14 

 July 18 

 July 16 



IV. AUTUMNAL FLORA 

 Principal Species 



Date of Appearance! 



Height of Blooming 



Solidago nana Nutt 



Erigeron macranthus Nutt 



Erigeron eximius Greene 



Dasystephana affinis (Griseb.) Rydb . . 

 Chamaenerion angustifolium (L.) Scop 



July 18 

 July IS 

 July 15 

 July 26 

 July 10 



July 26 

 July 24 

 July 24 

 Aug. 10 



Secondary Species and Date of Greatest Abundance 



Senecio eremophilus Rich 



Senecio nelsonii Rydb 



Carduus americanus (Gray) Greene . . 



Amarella plebeja (Cham.) Greene 



Agoseris purpurea (A. Gray) Greene.. 



Artemisia canadensis Michx 



Artemisia frigida Willd 



Geranium richardsonii Fish & Traut . 



Chrysopsis foliosa Nutt 



Anaphalis subalpina (A. Gray) Rydb 



Orthocarpus liiteus Nutt 



Phacelia heterophylla Pursh 



July 22 

 July 22 

 July 23 

 July 28 

 July 24 

 July 15 

 July 15 

 July 23 

 Aug. 10 

 July 26 

 July 25 

 July 20 



Summary. — The lodgepole-pine forest is the climax formation 

 on the hillsides of Boulder Park, and belongs to the montane life- 

 zone. The trees grow best on a moderate slope and in comparatively 

 dry soil. Where steeper slopes occur, there is generally an admixture 

 of Engelmann spruce and subalpine fir. In this locality the trees 

 have attained a height of 58 feet and are not over 150 years old. 



