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Satyrium carneum.Ground orchid with typical zygomorphic floral anatomy. Zygomorphic ("yoke shaped", "bilateral" – from the Greek ζυγόν, zygon, yoke, and μορφή, morphe, shape) flowers can be divided by only a single plane into two mirror-image halves, much like a yoke or a person's face.
Regular or radially symmetrical; [12] may be bisected into similar halves in at least two planes. Applies e.g. to stele s and flowers in which the perianth segments within each whorl are alike in size and shape. Compare regular. Contrast asymmetrical, irregular, and zygomorphic. aculeate Armed with prickle s, [13] e.g. the stem of a rose. acumen
Ourisia sessilifolia can be distinguished from O. simpsonii by regular calyces (vs. irregular), flowers and bracts in pairs or whorls (vs. in pairs only), 1 or 3 lines of hairs and purple inside corolla tubes (vs. glabrous and yellow inside corolla tubes), and glandular hairs that are much shorter than the non-glandular hairs (vs. long ...
Spiral flowers have no plane of symmetry and are said to be asymmetrical or irregular, as in the case of Liriodendron tulipifera (magnoliaceae). However, in the whorled flowers, because there are repetitions of floral parts, there may be one or more planes of symmetry, so they can have bilateral symmetry (i.e., a single plane of symmetry) or ...
When the perianth is bisected through the central axis from any point and symmetrical halves are produced, the flower is said to be actinomorphic or regular. This is an example of radial symmetry. When flowers are bisected and produce only one line that produces symmetrical halves, the flower is said to be irregular or zygomorphic. If, in rare ...
Many flowers are symmetrical in only one plane (i.e., symmetry is bilateral) and are termed irregular or zygomorphic (meaning "yoke-" or "pair-formed"). In irregular flowers, other floral parts may be modified from the regular form, but the petals show the greatest deviation from radial symmetry.
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The flowers are borne on a glabrous or hairy pedicel that is up to 64.7 mm long and has non-glandular hairs only. The calyx is 7.5–12.2 mm long, regular, with all lobes equally divided to the base, acute, and with smooth or irregularly notched edges, with a few non-glandular hairs to densely distributed hairs on the edges and base.