viii CLASSIFICATION. 



Sub-Classes of Class I. DICOTYLEDONS. 



Sub-class I. Thalamiflorae. — Petals 

 distinct from the calyx, and fi-om each 

 other, seldom wanting. Stamens usually 

 hypogynous, or nearly so (for exceptions 

 see p. ix). Families i-xxi 





Sub -class 2. Calyciflorae. — Petals 

 usually distinct, and stamens perigynous / 

 or epigynous (for exceptions see p. xi) 



Families xxii-xxxviii 



Sub -class 3. Monopetalae. — Petals 

 united (at least at the base) into a single 

 corolla (for exceptions see p. xii). 



Families xxxix-lx 



Sub -class 4. Monochlamydae. — Pe- 

 rianth really or apparently simple or 

 none (for exceptions see p. xiv) 



Families Ixi-lwiv 



