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In botany, a whorl or verticil is a whorled arrangement of leaves, sepals, petals, stamens, or carpels that radiate from a single point and surround or wrap around the stem or stalk. [ 1 ] [ 2 ] A leaf whorl consists of at least three elements; a pair of opposite leaves is not called a whorl.
A stereotypical flower is made up of four kinds of structures arranged in whorls around the tip of a short stalk or axis, called a receptacle. [ 11 ] [ 2 ] The four main whorls (starting from the base of the flower or lowest node and working upwards) are the calyx , corolla , androecium , and gynoecium .
The corolla is the inner whorl of the perianth and the one that surrounds the fertile whorls of the flower. It is composed of petals, which are generally larger than the sepals and are colored. Each petal consists of a claw that fixes it to the receptacle and a blade or limb which is the widest and most showy part.
Merosity (from the greek "méros," which means "having parts") refers to the number of component parts in a distinct whorl of a plant structure. [1] The term is most commonly used in the context of a flower where it refers to the number of sepals in a whorl of the calyx, the number of petals in a whorl of the corolla, the number of stamens in a whorl of the androecium, or the number of carpels ...
Whorls of the same organ are separated by "+". Organ counts within a whorl can be separated by ":", for example when part of the whorl is morphologically different. A range can be given if the number is variable, e.g. when the formula summarizes a taxon. K 3+3 – a calyx with six free sepals, arranged as two separate whorls; A∞ – many stamens
A cyclic flower is a flower type formed out of a series of whorls; [1] sets of identical organs attached around the axis at the same point. Most flowers consist of a single whorl of sepals termed a calyx; a single whorl of petals termed a corolla; one or more whorls of stamens (together termed the androecium); and a single whorl of carpels termed the gynoecium.
Either ray or disk flowers may be absent in some plants: Senecio vulgaris lacks ray flowers [4] and Taraxacum officinale lacks disk flowers. [4] [5] The individual flowers of a pseudanthium in the family Asteraceae (or Compositae) are commonly called florets. [6] The pseudanthium has a whorl of bracts below the flowers, forming an involucre.
Galium verum (lady's bedstraw [1] or yellow bedstraw) is a herbaceous perennial flowering plant in the family Rubiaceae.It is widespread across most of Europe, North Africa, and temperate Asia from Palestine, Lebanon and Turkey to Japan and Kamchatka.