175] FLORA OF BOULDER, COLORADO 27 



b. Pratenses. The foot-hill meadow is not very unlike 

 the mesa meadow ; the species are in part the same, but there 

 is no sharp line between the flora of the foot-hill forest and the 

 foot-hill meadow, on account of the openness of the former. 

 Only where the forest is dense enough to have a truly sylvan 

 floor, are the light-loving plants absent. The foot-hill meadow 

 society includes various grasses and certain herbs, such as 

 painted-cups, fleabanes, Mariposa lilies, anemones, gaillardias, 

 and the like. The following are the characteristic grasses and 

 sedges : 



Stipa comata B. Pumpellianus 



S. viridula Agropyron Vaseyi 



S. Nelsonii A. Richardsoni 



S. Scribneri A. violaceum 



Calamagrostis purpurascens A. pseudorepens 

 Koeleria cristata Elymus ambiguus 



Poa platyphylla E. strigosus 



P. crocata E. villiflorus 



P. longiligula Carex marcida 



P. longipedunculata C. Douglasii 



Festuca brachyphylla C. festiva 



F. confinis C. petasata 



Bromus lanatipes C. pratensis 



B. Richardsonii C. siccata 



c. Vallicolae. The foot-hill carion society consists of 

 dense thickets of hazel, dwarf birch, willows, dogwoods, al- 

 ders, and the like. About springs and along small rills is 

 found a brief fontinal vegetation, the most delicate of all the 

 plant-groups — mosses, liverworts, ferns, tway-blades, adder's- 

 mouths, twisted-stalks, mountain lilies, shooting stars, cresses, 

 sedges, and bog-orchids. The foot-hill canon flora differs from 



