250 



THE FLOWER. 



Didynamous is a term applied to an androecium of four sta- 

 mens in two pairs, a longer and a shorter, as in Fig. 361. 



Tetradynamous is similarly applied to that of six stamens, two of 

 them shorter, in the manner characteristic of Cruciferse, Fig. 396. 



454. Terms which denote coalescence of stamens, whether by 

 their filaments or their anthers, are 



Monadelphous, that is, in one brotherhood, by coalescence of 

 the filaments into a tube, as in the Mallow (Fig. 485) , Lupine 

 (Fig. 484), Lobelia (Fig. 488), &c. 



Diadelphous, in two brotherhoods, by coalescence of the fila- 

 ments into two sets ; sometimes an equal number in each, as in 

 Fumariaceae (Fig. 390), sometimes nine in one set and one 

 separate, as in the Pea (Fig. 483) and most Papilionaceae. 



Triadelphous, with filaments united in three sets or clusters, as 

 in Hypericum. 



Pentadelphous, in five sets, as in Linden, Fig. 398, 399. 

 But in general, when the sets are several, without regard to the 

 number the stamens are said to be Polyadelphous. 



Syngenesious, when the stamens are united by their anthers 

 into a tube or ring ; as in the whole vast order of Composite 



(Fig. 486, where they are five in number and the filaments dis- 

 tinct), in Cucurbita (Fig. 489, 490, where they are three in 

 number and the filaments partly monadelphous) , and in Lobelia 

 (Fig. 488, where they are also five and the long filaments are 

 mainly monadelphous) . 



FIG. 488. Flower of Lobelia cardinalis, with tube of corolla divided on one side ; 

 filaments and anthers united into a tube: /. tube of filaments; a. of anthers. 



FIG. 489. Male flower of Cucurbita (Squash), with limb of calyx and corolla cut 

 away, to show the stamens, viz., three filaments, separate at base but monadelphous 

 above, and three syngenesious anthers in a kind of head. 490. Stamens of the same, 

 enlarged and the upper part cut away, to show the union. The anthers are sinuous. 

 491. A detached stamen of the Melon, with loosely sinuous anther. 



Fig. 492. Stamens and style of a Cypripedium, united into one body or column: 

 o. anthers; it. enlarged sterile stamen; stig. the stigma. 



