. A manual of structural botany; an introductory textbook for students of science and pharmacy. Plant morphology. 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
. A manual of structural botany; an introductory textbook for students of science and pharmacy. Plant morphology. 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 /J^ 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for r
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