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Distichous leaf arrangement in Clivia. Distichous phyllotaxis, also called "two-ranked leaf arrangement" is a special case of either opposite or alternate leaf arrangement where the leaves on a stem are arranged in two vertical columns on opposite sides of the stem. Examples include various bulbous plants such as Boophone.
Compound leaves may be pinnate with pinnae (leaflets) on both sides of a rachis (axis), or may be palmate with multiple leaflets arising from a single point. [1] Leaf structure is described by several terms that include: Bipinnate leaf anatomy with labels showing alternative usages A ternate compound leaf with a petiole but no rachis (or rachillae)
180° (or 1 ⁄ 2): two leaves in one circle (alternate leaves) 120° (or 1 ⁄ 3): three leaves in one circle; 144° (or 2 ⁄ 5): five leaves in two gyres; 135° (or 3 ⁄ 8): eight leaves in three gyres. Most divergence angles are related to the sequence of Fibonacci numbers F n. This sequence begins 1, 1, 2, 3, 5, 8, 13; each term is the ...
Leaf whorls on a herbaceous Lilium michiganense Leaf whorls on a woody tree, Brabejum stellatifolium 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. Referring to the arrangement of floral or foliar organs in a bud when each organ or segment has one edge overlapping the adjacent organ or segment; a form of imbricate arrangement. See contort. 2. (of leaves) A type of vernation in which one leaf is rolled up inside another. 3.
In botany, a rosette is a circular arrangement of leaves or of structures resembling leaves. In flowering plants, rosettes usually sit near the soil. Their structure is an example of a modified stem in which the internode gaps between the leaves do not expand, so that all the leaves remain clustered tightly together and at a similar height.
In the case of the whorled or cyclic arrangement, the pieces are inserted at various nodes of the axis, arranged in whorls or cycles. Each floral piece of a whorl alternates with the pieces of the following whorl, for example, the petals alternate with the sepals. In these flowers, called cyclic or whorled, the number of whorls may vary ...
Used for leaf fungus that live on the surface of the leaf. Epiphloedal – growing on the bark of trees. Epiphloedic – an organism that grows on the bark of trees. Epiphyllous – growing on the leaves. For example, Helwingia japonica has epiphyllous flowers (ones that form on the leaves). [5] Epiphyte – growing on another organism but not ...