[Chap. XXXV 



VEGETATIVE MULTIPLICATION 



421 



usually 2 to 3 inches long, are covered with about one-half inch of soil. 

 They differ from stem cuttings in the absence of preformed shoot buds. 

 Owing to the polarity of the roots, adventitious shoot buds usually de- 

 velop from the upper, or basal, end of the cutting and roots develop from 



Fig. 194. Vegetative multiplication of plants from leaf cuttings: A, Bryophtjllum 

 calycinum; B, Crassula; C, Sanseveria; D, English ivy; E, bud scale of lily; F, 

 Bn/ophi/lhim crenatum; G, yam; H, Echeveria. 



