*HB NATURAL SYSTEM. 263 



Of these, those marked f contain trees principally. 

 Those marked * have but few British species. Those 

 families numbered 5, 6, 7, 8, 10, 11, 12, 14, and 16 are 

 polypetalous. Those numbered 9 and 19 to 25 inclu- 

 sive, are monopetalous one petal only. 



The families that require study, from the number 

 of genera they contain, are four : 



a. The Leguminous family, the flowers of which 

 are butterfly-shaped (papilionaceous), as the gorse 

 and pea. Fruit in a pod. This family is the same as 

 the Linnsean class 17, Diadelphia, order Decandria. 



b. The Eose family has flowers of many stamens 

 attached to the orifice of a calyx. This class is the 

 same as the Linnaean class 12, Icosandria. 



e. The Umbelliferous family has flowers with five 

 stamens, and two carpels arranged in umbels. 



d. The Composite family have the anthers united, 

 and form a tube round the style. This peculiarity 

 distinguishes it from the Scabious family, Linnaean 

 class 19, Syngenesia. If the flower belongs to neither 

 of these families, it will not be difficult to refer it to its 

 proper family. 



3. Corollifloroe. In this sub-class are sometimes 

 included the monopetalous members of CalyciflorcB. 



