Changes are produced in the whorl of stamens by cohesion of the filaments to a greater or less extent, while the anthers remain free; thus, all the filaments of the androecium may unite, forming a tube round the pistil, or a central bundle when the pistil is abortive, the stamens becoming monadelphous, as occurs in plants of the Mallow tribe; or they may be arranged in two bundles, the stamens being diadelphous, as in Polygala, Fumaria and Pea; in this case the bundles may be equal or unequal.
The stamens are diadelphous, nine of them being united by their filaments (f), while one of them (e) is free; st, stigma; c, calyx.
The stamens are diadelphous, nine of them being united by their filaments f, while the uppermost one (e) is free; st, stigma, c, calyx.
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