APPENDAGING 



67 



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

 acting separately or together, is responsible for a number of character- 

 istic and important states of the androecium requiring distinctive 

 terms. 



The Didynamous Androecium. — In the 5-merous flower of Scutellaria 

 (Fig. 151) six stamens are suppressed and the remaining four are 

 irregular, there being a pair of each form. This form of androecium 

 has received the title of Didynamous. In this case the anthers of a pair 

 are connivent also. 



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Fig. 146. Diadelphous androecium of Glycyrrhiza. 147. Vertical section through flower of Guarea, 

 showing monadelphous filaments with distinct anthers. 148. Cohesion of filaments, incomplete at 

 base, in flower of squash. 149. The same, incomplete at summit, in flower of Sidalcea. 150. Vertical 

 section through flower of Asclepias 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 Eu-patoriuyn, the anthers coherent, the filaments distinct. 153. Monadelphous 

 filaments and anthers of Lobelia. 



The Tetradynamous Androecium. — In that of the Mustard (Fig. 33), 

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

 these differing in length from the undivided pair. This form is styled 

 Tetradjmamous. 



Appendaging. — No other subject connected with the androecium calls 

 for such close and discriminating attention in connection with pharma- 

 cognosy as the products of exaggerated growth and enation. No 

 portion of the androecium is free from their effects, which apply equally 

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

 of appendage to the filament is that of stipuloid appendages to the 



