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  2. Petal - Wikipedia

    en.wikipedia.org/wiki/Petal

    Claws are distinctly developed in petals of some flowers of the family Brassicaceae, such as Erysimum cheiri. The inception and further development of petals show a great variety of patterns. Petals of different species of plants vary greatly in color or color pattern, both in visible light and in ultraviolet.

  3. Rose (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Rose_(mathematics)

    A rose with k = 1 is a circle that lies on the pole with a diameter that lies on the polar axis when r = a cos (θ). The circle is the curve's single petal. (See the circle being formed at the end of the next section.) In Cartesian coordinates, the equivalent cosine and sine specifications are. and.

  4. Floral diagram - Wikipedia

    en.wikipedia.org/wiki/Floral_diagram

    Basic characteristics and significance. A floral diagram is a schematic cross-section through a young flower. [1] It may be also defined as “projection of the flower perpendicular to its axis”. [3] It usually shows the number of floral parts, [Note 2] their sizes, relative positions and fusion.

  5. ABC model of flower development - Wikipedia

    en.wikipedia.org/wiki/ABC_model_of_flower...

    The ABC model of flower development is a scientific model of the process by which flowering plants produce a pattern of gene expression in meristems that leads to the appearance of an organ oriented towards sexual reproduction, a flower. There are three physiological developments that must occur in order for this to take place: firstly, the ...

  6. Double-flowered - Wikipedia

    en.wikipedia.org/wiki/Double-flowered

    When both copies of the gene are deleted or otherwise damaged, developing flowers lack the signals to form stamen and carpel segments. Regions which would have formed stamens instead default to petals and the carpel region develops into a new flower, resulting in a recursive sepal-petal-petal pattern. Because no stamens and carpels form, the ...

  7. Floral morphology - Wikipedia

    en.wikipedia.org/wiki/Floral_morphology

    Perianth of a Primula flower, a sepal and a petal are pointed out.. The perianth is the flower structure comprising the two sterile whorls, the calyx and the corolla. In many cases, as for example in weeping willow (Salix babylonica, salicaceae) or European ash (Fraxinus excelsior, oleaceae) the perianth may be missing, that is, the flowers have only the fertile whorls (androecium and ...

  8. Floral symmetry - Wikipedia

    en.wikipedia.org/wiki/Floral_symmetry

    Floral symmetry. [Left] Normal Streptocarpus flower ( zygomorphic or mirror-symmetric), and [right] peloric (radially symmetric) flower on the same plant. Floral symmetry describes whether, and how, a flower, in particular its perianth, can be divided into two or more identical or mirror-image parts. Uncommonly, flowers may have no axis of ...

  9. Tessellation - Wikipedia

    en.wikipedia.org/wiki/Tessellation

    In botany, the term "tessellate" describes a checkered pattern, for example on a flower petal, tree bark, or fruit. Flowers including the fritillary, and some species of Colchicum, are characteristically tessellate. Many patterns in nature are formed by cracks in sheets of materials. These patterns can be described by Gilbert tessellations ...

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