zygomorphic

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zygomorphic

(of flowers) exhibiting BILATERAL SYMMETRY.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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(2010) proposed that the evolution from zygomorphy to actinomorphy in these genera was possibly due to shifts in pollination strategies, such as a switch from nectar- to pollen-rewards and/or from specialist to generalist pollinators or vice versa.
Such different degrees of monosymmetry were first discussed by Delpino (1887) who distinguished four levels of monosymmetry (zygomorphy): (1) very recent in evolutionary terms (deflection of styles and stigma), (2) recent, (3) old, and (4) very old (abortion of organs on one side).
Floral zygomorphy, the recurring evolution of a successful trait.
Table II illustrates the strong link between zygomorphy and the occurrence of adaxial staminodes spread over different genera Notable exceptions with anterior staminodes are Emblingia (Erdtman et al., 1969), Lopezia (Eyde & Morgan, 1973), and Pelargonium (Kumar, 1976; Sattler, 1973).