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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.
A decussate leaf pattern Decussate phyllotaxis of Crassula rupestris. The whorled arrangement is fairly unusual on plants except for those with particularly short internodes. Examples of trees with whorled phyllotaxis are Brabejum stellatifolium [4] and the related genus Macadamia. [5]
Main whorled patterns. A whorl (/ w ɜːr l / or / w ɔːr l /) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). [1] [2]
Whorled leaf pattern of the American tiger lily. Perennial plants whose leaves are shed annually are said to have deciduous leaves, while leaves that remain through winter are evergreens. Leaves attached to stems by stalks (known as petioles) are called petiolate, and if attached directly to the stem with no petiole they are called sessile. [19]
Myriophyllum verticillatum, the whorl-leaf watermilfoil [4] or whorled water-milfoil, [5] is a native to much of North America, North Africa, and Eurasia.It closely resembles another native milfoil, called northern water milfoil (M. sibiricum) [6] Whorled water milfoil is also easily confused with four types of invasive milfoils: Eurasian water milfoil (M. spicatum), Variable water-milfoil (M ...
Regular leaves of a mature plant, produced above the base, as opposed to bathyphyll. acrostichoid (describing a type of sorus) Covering the entire abaxial surface of a frond, usually densely so, as in Elaphoglossum and Acrostichum. actino-Prefix that indicates a radial pattern, form, or morphology. actinodromous
Chart illustrating leaf morphology terms. The following terms are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (that is, the leaf blade or 'lamina' is undivided) or compound (that is, the leaf blade is divided into two or more leaflets). [1]
[7] [10] Simple angiosperm leaves arranged in a whorled pattern emerge from the base of the plant. [7] Each whorl is decussate (rotated by half the angle between the leaves in the whorl below), with only two or three whorls around the base. [4] [10] Each leaf is sessile (attaching directly to the plant), and about 12 inches (300 mm) in length.