H R Pi F H F H F H H C 



Qufldrat^bisect showing root syetemB of shrubs and herbs of the forest floor. This was made along 

 the front edge of the qua^iat shown in plate 27 B : H, Haplopappus parryi; R, Rosa adadaTis; 

 Pi, Pinus fiexiUa; F, Fragaria virginiana; C, Chamasneriumarigustifolium; V, Picea engelmanni. 



