In botany, awhorl orverticil is awhorled arrangement ofleaves,sepals,petals,stamens, orcarpels 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 ofopposite leaves is not called a whorl.
For leaves to grow in whorls is fairly rare except in plant species with very shortinternodes. Genera with species having whorled leaves includeGalium,Nerium,Elodea, andLilium. Leaf-likebracts may also be whorled (as inTrillium, e.g.). Leaf whorls occur in some trees such asBrabejum stellatifolium and other species in the familyProteaceae (e.g., in the genusBanksia). In plants such as these, crowded internodes within the leaf whorls alternate with long internodes between the whorls.
Themorphology of mostflowers (calledcyclic flowers) is based on four types of whorls:
A flower lacking any of these floral structures is said to beincomplete orimperfect.[3] Not all flowers consist of whorls since the parts may instead be spirally arranged, as in the familyMagnoliaceae.
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