THE FLOWER 



93 



similar parts, that is, parts of different organs. For 

 example, the union of a sepal with a sepal, of a petal 

 with a petal, and of a stamen with a stamen, are 

 instances of cohesion ; while the union of a stamen 

 with a corolla, and of a petal with a calyx, are in- 

 stances of adhesion. 



Cohesion and Length of Stamens. — The 

 stamens may be either free or coherent (fig. 88). 



b 



S. — Stamens 



ti, Monade]phoi4&. b, Diadelphous. c, Polyadelphous. ti, Syng-cnesious. 

 e, Gynandrous. f, Tetradynamous. ^, Didyiiamovis, 



Coherent stamens are either monadelphous — a, as in 

 jaba; or diadelphous — b, as in Pea; or POLYADEi,=t 

 PHOUS — c, as in Orange, Castor-oil, and kajupati oiU 

 yielding plant {Melaletica) and Hypericuvi (see fig. 

 i6o), when the stamens cohere by their filaments to 

 form either one, two, or more than two bundles, 

 the anthers remaining free. When the stamens 

 cohere by their anthers, the filaments remaining 

 free, they are said to be syngenesious — d, as in 

 Sunflower and gendha. When there are four free 

 stamens, of which two are long and two short, they 



