Photo by] 



[Henry Troth. 



FIG. 223. BULBOUS BUTTERCUP (Ranunculus bulbosus). 



These plants produce special roots whose office is to draw the stem structure from which they originate down with 



them, to prevent their elevation above the surface. The same phenomenon has been observed in the Carrot, Evening 



Primrose, Martagon Lily, Monkshood, Dandelion, Daisy, and other plants. 



179 



