with seven, heptandrous ; willi eight, octandrous ; with nine, cnnean- 

 drous ; with ten, decandrous ; with twelve, dodecandrous. When 

 more than twelve, and inserted on the calyx, they are isocandrous, or 

 when inserted on the receptacle, polyandrous. 



518. As to their union with each other, this may take place in 

 various ways. Sometimes the filaments are combined, while the 

 anthers are distinct. "When thus united by their filaments into one 

 set, they are said to be monadelphous ; as in the Lupine, &c. (Fig. 



4G2) and Mallow. 

 "When united by their 

 filaments into two 

 sets, they are diadcl- 

 phous, as in most 

 plants of the Pulse 

 family, Avherc nine 

 stamens form one set 

 and the tenth is soli- 



401 462 463 4S4 ,,,.,„ i 



tary (I'ig. 401) ; and 

 in Dicentra (Fig. 3 GO - 371), where the six stamens are equally com- 

 bined in two sets. When united or ar- 

 ranged in three sets or parcels, they are 

 said to be triadelphous, as in the com- 

 mon St. Johnswort ; or if in several, 

 polyadelphous ; as in Linden. When 

 stamens are united by their anthers into 

 a tube or ring, they are said to be syn- 

 genesious (Fig. 4G3, 464). This occurs 

 in the whole vast order of Composite. 

 Here the five filaments are distinct ; 

 whereas in Lobelia, and also in the 

 Melon and Gourd (Fig. 465, 466), both 

 the filaments and the anthers are united 

 monadelphous as well as syngenesious. 



519. As to insertion, stamens are hypogynous (4GG) when b6rne 

 on the receptacle, that is, when not adnate to any other organ ; 



that is, the stamens are 



FIG. 4G1 Diadelphous ^tamens (3 and 1) of a Pea. 4G2 Monadelphous stamens of a 

 Lupine. 



FIG. 4G3 Five syngeiesious stamens of a Composita. 4G4. The same, laid open. 



FIG 4G5. Column of stair.cns at o::ce triadelphous and syesenesious. of the Gourd : the 

 floral envelopes cut away. 4G3. A crosj-scctiou of tile united anthers, nearly the natural size. 

 4G7. A sinuous anther of the Melon. 



