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 (ăk-tĭn′ō-môr′fĭk, ăk′tə-nō-) also ac·tin·o·mor·phous (-fəs)
adj. Botany
Capable of being divided into equal halves along any diameter, as the flowers of a rose or tulip; radially symmetrical.

ac·tin′o·mor′phy n.


(ˌæktɪnəʊˈmɔːfɪk) or


(Botany) botany (esp of a flower) having radial symmetry, as buttercups. See also zygomorphic
ˈactinoˌmorphy n


Relating to a flower that can be divided into equal halves along any diameter; radially symmetrical. The flowers of the rose and tulip, for example, are actinomorphic.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.actinomorphic - capable of division into symmetrical halves by any longitudinal plane passing through the axisactinomorphic - capable of division into symmetrical halves by any longitudinal plane passing through the axis
biological science, biology - the science that studies living organisms
bilaterally symmetrical, zygomorphic, zygomorphous - capable of division into symmetrical halves by only one longitudinal plane passing through the axis
References in periodicals archive ?
dots or stripes on corolla); (vi) floral symmetry (actinomorphic or zygomorphic); (vii) stamen number (two, four or five); (viii) anther position (determined by the anther location relative to the corolla tube, i.
Floral symmetry is an important trait both in taxonomy and in pollination systems, and normally zygomorphy is thought to be more specialized in pollination adaptations, since it restricts pollinator behaviors and can therefore increase pollination efficiency (Sargent, 2004; Gong & Huang, 2009).
In flowering plants, floral symmetry is a reliable cue for high phenotypic and genotypic fitness: flowers that exhibit greater symmetry tend to be larger and generally produce more nectar than asymmetrical neighbors (Mqller and Eriksson, 1994; Wolfe and Krstolic, 1999; Frey et al.
counting numbers of parts or determining whether the same types of parts are free from each other or united), but others, such as floral symmetry and gynoecium structure, are more complex.
In contrast to my former syntheses on floral symmetry (Endress, 1999, 2001 a) this study goes more deeply into the diversity of monosymmetry and asymmetry expressions and more broadly into the systematic distribution.
Advancement in our knowledge of floral symmetry will continue to be based on advances in phylogenetic reconstruction, molecular developmental genetics, and function of flowers of different monosymmetry and asymmetry types.
Antirrhinum and Asteridae-Evolutionary changes of floral symmetry.