PLANT IDENTIFICATION. 205 



There is greatest tendency to variation in the number of 

 stamens, this ranging from 13 to 20. 



Petals are yellow, free, 4 in number normally. Carpels 

 generally 8, free, superior with stigma curved, achenes in 

 fruit. There are nectaries on top of receptacle at base of 

 stamens. 



Habitat. Grows abundantly on moor-lands, roadsides, 

 and on banks of streams. Pollination. Cross pollination 

 is effected by the aid of small beetles and flies. There is 

 a double provision for the perpetuation of the species in 

 the production of seeds and by the perennial underground 

 stem- 

 Such exercises are desirable for the training of the 

 teacher, if he is successfully to guide pupils towards seeing 

 the significance of the structure of some of the commonest 

 flowers and trees of the waysides, fields, or woods. As 

 already indicated they are of fundamental importance to 

 the pupils (see p. 266). 



