AN INTRODUCTION TO PLANT BIOLOGY 121 



with other cells (i.e., fertilization by cells derived from pollen- 

 grains) before developing into new plants. 



110. Classification of the Bean Plant. By this we mean 

 the relation of the bean plant to other plants. In the first 

 place, the bean plant is a member of the great division of 

 flowering plants or seed-plants. Within this division are 

 many families, one of which is the family of leguminous plants 

 (including peas, beans, vetches, clovers, locusts, and numerous 

 other plants which have an irregular flower similar to that 

 of the bean plant). In this family are included a number 

 of bean-like plants which are somewhat different from ordi- 

 nary garden beans (e.g., Windsor beans and horse beans). 

 The common garden beans belong to the genus Phaseolus 

 and to the species vulgaris, hence the scientific name is Phaseo- 

 lus vulgaris. The various kinds of ordinary beans are varieties 

 of the same species. The Windsor and horse beans belong 

 to another genus. 



The meaning of classification of animals and plants will 

 be discussed in Chapter VII. 



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