Principles of Classification. 
IT 
purpose of ascertaining to what class, order, genus, and 
species they belong, is next to be attempted. Flowers 
in different states, some that are expanded, some not 
yet unfolded, and some which have ripened their fruit 
or seed, should be selected ; and, in determining the 
class, the number, situation, proportion^ or connection* 
of the stamens, is to be considered. 
By comparing the descriptions with the figures in 
the engravings, the student will be greatly assisted in 
this investigation. 
PI. 1 . fig. 1 . Monandria class, in which one stamen is 
seen. Fig. 2. Diandria , with two stamens and the pis- 
til rising between them. Fig. 3. Triandria, three 
stamens, a, the stamens and pistil separated from the 
flower ; 1 , 1 , 1, the stamens ; 2, 2, 2, the stigmas. 
Fig. 4. Tetrandria , four stamens and one pistil. Fig. 5. 
Pentandria, five stamens. . Fig.. 6. Hexandria class, in 
which six stamens are seen surrounding the pistil. Fig. 
*7. Heptandria class, with seven stamens. Fig. 8, Qc* 
iandria class with eight stamens. 
Plate 2 fig. 0. Enneandria class, having nine stamens. 
Fig. 10 . Decandria, with ten stamens. Fig. 1 1 . Dode<* 
eandria, class, having twelve stamens ; a. the corolla laid 
open to shew the stamens. Fig. 12. Icosandria class* 
from twelve to twenty stamens rising , from the, cup ; a. 
the corolla removed shewing the insertion of the sta- 
mens. Fig. 13. Polyandria class, with numerous sta-* 
mens rising from the receptacle ; a. the. corolla separa- 
ted to shew their, insertion. Fig. 14. Didynamia , in 
which two stamens are long and two short. Fig. 15. 
Tetradynamia , having six stamens, four of which are long 
and two short. Fig. 16. Monadelphia, in which all the 
