THE LINNJEAN ARTIFICIAL SYSTEM. 357 



Class 1. MONANDRIA includes all such plants with one stamen to 

 the flower; as in Hippuris (Fig. 703). 



2. DIANDRIA, those with two stamens, as in the Lilac. 



3. TRIANDRIA, with three stamens, as in the Valerian, &c. 



(Fig. 764, 767). 



4. TETRANDRIA, with four stamens, as in the Plantain (Fig. 



831). 



5. PENTANDRIA, with five stamens, the most frequent case 



(Fig. 256, 335). 



6. HEXANDRIA, with six stamens, as in the Lily Family (Fig. 



1108), &c. 



7. HEPTANDRIA, with seven stamens, as in the Horsechest- 



nut (Fig. 657). 



8. OCTANDRIA, with eight stamens, as in the Dirca (Fig. 



1009). 



9. ENNEANDRIA, with nine stamens, as in the Rhubarb. 



10. DECANDRIA, with ten stamens, as in Fig. 285, 288. 



11. DODECANDRIA, with twelve stamens, as in Asarum (Fig. 



968) and the Mignonette ; extended also to include 

 those with from thirteen to nineteen stamens. 

 The two succeeding classes include plants with perfect flowers, 

 having twenty or more unconnected stamens, which, in 



12. ICOSANDRIA, are inserted on the calyx (perigynous, 466) 



as in the Rose Family ; and in 



13. POLYANDRIA, on the receptacle (hypogynous), as in the 



Buttercup, Anemone (Fig. 325), &c. 



Their essential characters are not designated by their names ; 

 the former merely denoting that the stamens are twenty in num- 

 ber ; the latter, that they are numerous. The two following de- 

 pend upon the relative length of the stamens, namely, 



14. DIDYNAMIA, including those with two long and two short 



stamens (481, Fig. 855) ; and 



15. TETRADYNAMIA, those with four long and two short sta- 



mens, as in Cruciferous flowers (Fig. 526). 

 Their names are Greek derivatives, signifying in the former that 

 two stamens, and in the latter that four stamens, are most power- 

 ful. The four succeeding are founded on the connection of the 

 stamens : 



16. MONADELPHIA (meaning a single fraternity), with the fil- 



aments united in a single set, tube, or column, as in 

 Fig. 307, and in all the Mallow Family, Fig. 617. 



