Quadral>bisect io the hfllf-gravel slide. The face of the trench was cut along the front of the 

 quadrat shown in Plate 26 A: S, Solidago oreophila; A, AUium cemuum; E, Elymus trUicotdes, 

 fragments of which are represented in blue; C, Calamagroatis purpurascens; H, Hetuhera 

 parvifolia; B, Besseya plantagivea. 



