BULBS, BULBLETS AND BUBS 357 



house ; and in this case, the bud has been de- 

 veloped by man through the process of continually 

 selecting for seed plants which have the densest 

 or most coveted buds or heads. 



445. We can distinguish bulbs from normal 

 buds, then, by saying that bulbs directly give rise 

 to other bulbs which produce plants ; and these 

 plants may produce bulbs directly, or may bear 



Fia. 374. Fig. 375. 



Winter bud of anacharis. Winter bud of myriophyllum. 



seeds which produce plants which produce bulbs. 

 Buds give rise to growing shoots which may pro- 

 duce flowers and seeds, and these seeds produce 

 plants which produce buds. We cannot carry this 

 distinction far, however, because bulbs not only 

 produce other bulbs by lateral growth, but at the 

 same time produce a growing vertical shoot or 

 axis; and we shall find, also, that buds may 

 separate from the parent in essentially the same 

 way that the bulblets of the tiger lily do. The 

 point is that pl&nts may propagate by either sex- 

 ual or asexual means, or by both means. 



