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Floral symmetry
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Floral symmetry describes whether, and how, a flower, in particular its perianth, can be divided into two or more identical or mirror-image parts.
[Left] Normal Streptocarpus flower (zygomorphic or mirror-symmetric), and [right] peloric (radially symmetric) flower on the same plant
[Left] Normal Streptocarpus flower (zygomorphic or mirror-symmetric), and [right] peloric (radially symmetric) flower on the same plant
Wurmbea stricta, its tepals in actinomorphic arrangement
Wurmbea stricta, its tepals in actinomorphic arrangement
Satyrium carneum. Ground orchid with typical zygomorphic floral anatomy
Satyrium carneum. Ground orchid with typical zygomorphic floral anatomy
Digitalis purpurea (common foxglove) displaying an aberrant peloric terminal flower and normal zygomorphic flowers
Digitalis purpurea (common foxglove) displaying an aberrant peloric terminal flower and normal zygomorphic flowers
Symmetry in biology
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Symmetry in biology refers to the symmetry observed in organisms, including plants, animals, fungi, and bacteria. External symmetry can be easily seen by just looking at an organism. For example, the
Floral symmetry
…of longitudinal planes passing through the axis: oleander is an example of a flower without such mirror planes. Actinomorphic flowers are also called radially symmetrical or regular flowers. Other examples of actinomorphic flowers are the lily (Lilium, Liliaceae) and the buttercup (Ranunculus, Ranunculaceae). Zygomorphic…
A selection of animals showing a range of possible body symmetries, including asymmetry, radial, and bilateral body plans
A selection of animals showing a range of possible body symmetries, including asymmetry, radial, and bilateral body plans
Illustration depicting the difference between bilateral (Drosophila), radial (actinomorphic flowers) and spherical (coccus bacteria) symmetry
Illustration depicting the difference between bilateral (Drosophila), radial (actinomorphic flowers) and spherical (coccus bacteria) symmetry
Lilium bulbiferum displays hexamerism with repeated parts arranged around the axis of the flower.
Lilium bulbiferum displays hexamerism with repeated parts arranged around the axis of the flower.
Apple cut horizontally showing that pentamerism also occurs in fruit
Apple cut horizontally showing that pentamerism also occurs in fruit