APPEND AGING 



C7 



Asymmetry and Irregularity. — A lack of symmetry aiul regularity, 



actinu' sci)arately or tout'tluT, is responsible for a number of character- 

 istic and iinpoi-tant states of the androecium requiring,' distinctive 

 terms. 



The Didynamous Androecium.- In the o-merous flower of ScidcUarid 

 (Fii;-. l")!) six stamens are su])pressed and the rcniaininijj four are 

 irr('<;ulai-, there being a pair of each form. This foi-ni of anch'oeciiim 

 has received the title of Didynamous. In this case the antlicrs of a j)air 

 are connivent also. 



/J4 



Fig. 140. Diadelphous arulroerium of Glycyrrhiza. 1-17. Vertical section lliroiigh flower of Guarea, 

 showing nionadelphous filaments witli distinct anthers. 148. Cohesion of filaments, incomplete at 

 base, in flower of squash. 149. The same, incomplete at summit, in flower of SiV/afcca. 150. Vertical 

 section through flower of Asdepias showing coherent filaments and anthers, with appendages to crown 

 in form of horns. 154. Winged androecium of same. 151. Didynamous androecium of Labiatae 

 152. Androecium of Eupatorium, the anthers coherent, the filamenta distinct. 153. Monadelphous 

 filaments and anthers of Lobelia. 



The Tetradynamous Androecium.^In that of the IMustard (Fig. 33), 

 two of the stamens Iuinc each by chorisis become converted into two, 

 these differing in length from the undi\i(led pair. 'J'his form is styled 

 Tetraflynanions. 



Appendaging. No other subject connected with the androecium calls 

 for such close and discriminating attention in connection with pharma- 

 cognosy as the i)roducts of exaggerated growth and enation. No 

 portion of the androecium is free from their effects, which ai)ply equally 

 to it when adherent or coherent, free or distinct. The simplest form 

 of appendage to the filament is that of sti])nloid a])])endages to the 



