FLORA OF BOULDER, COLORADO 



41 



alpine vegetation at the line of perpetual snow, with the alter- 

 nate freezing by night and thawing by day, with the keen light, 

 and bleak winds, and the fierce fury of the storms? And yet 

 the alpine flora is exquisitely beautiful. It shares the fascina- 

 tion of its sublime mountain home, to which it lends the only 

 touch of delicate grace. I append a list of alpine summit 

 species, most of which I found on Arapahoe Peak or are known 

 to grow there: 



Trisetum subspicatum 



Poa crocata 



P. rupicola 



P. Pattersonii 



P. longipedunculata 



Festuca brachyphylla 



F. minutiflora 



Agropyron violaceum 



Carex incurva 



C. atrata 



C. chalciolepis 



C. rigida 



C. chimaphila 



C. nigricans 



C. Pyrenaica 



C. rupestris 



C. obtusata 



C. capillaris 



Juncus triglumis 



J. castaneus 



Allium Pikeanum 



Erythronium parviflorum 



Lloydia serotina 



Salix pseudolapponicum 

 S. petrophila 

 S. Saximontana 

 Monolepis Nuttalliana 

 Oxyria digyna 

 Paronychia pulvinata 

 Claytonia megarrhiza 

 Oreobroma pygmaea 

 Arenaria Tweedyi 

 A. Fendleri 

 Alsinopsis propinqua 

 A. obtusiloba 

 Silene acaulis 

 Aquilegia coerulea 

 Ranunculus adoneus 

 Thlaspi Nuttallii 

 T. purpurascens 

 Erysimum nivale 

 E. Cockerelhanum 

 Draba crassifolia 

 D. cana 

 D. streptocarpa 

 D. luteola 



