VEGETA TIVE REPKOD UCTION. 



213 



readily separate from the axils of the leaves of some garden 

 lilies (fig. 180), and those which replace the flowers in some 

 cultivated onions, are well known. (Compare also fig. 68.) 



Fig. 181. — Yoxi&^&^i.(Potantogeton crispus). Detachment of special shoots, hiber- 

 nacula, which are to hibernate under water. The plant A has one of these shoots at 

 the tip ; B has just loosened one, A, which is sinking to the bottom. Two thirds natural 

 size. — After Kemer. 



300. (h) Winter shoots. — Somewhat similar but more 

 highly developed brood buds are formed at the approach of 

 winter about the base of the stem in many perennials with 

 herbaceous tops. These are separated by the death of the 

 parent stem and produce new plants in the spring. Some 

 aquatics show a similar hal^it, dropping short shoots to the 

 bottom of the water in autumn, which are to grow in the 

 spring (fig. 181). 



301. (c) Offsets, etc. — Some plants produce special 

 branches, either underground or aerial, which develop at 

 their extremities new plants, or special structures for their 



