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Leaves may also be whorled if several leaves arise, or appear to arise, from the same level (at the same node) on a stem. Veronicastrum virginicum has whorls of leaves separated by long internodes . With an opposite leaf arrangement, two leaves arise from the stem at the same level (at the same node ), on opposite sides of the stem.
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 .
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]
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.
An alternative spelling of caespitose, meaning tufted or turf-like, e.g. the growth form of some grasses. chamber A cavity of an ovary. channelled Sunken below the surface, resulting in a rounded channel. chartaceous Having a papery texture. chasmogamous Of flowers that are pollinated when the perianth is open. Compare cleistogamous. chasmophyte
Alternate – buds are staggered on opposite sides of the branch. Bark – the outer layers of woody plants: cork, phloem, and vascular cambium. Branches – Bud – an immature stem tip, typically an embryonic shoot, either producing a stem, leaves, or flowers. Bulb – an underground stem normally with a short basal surface and with thick ...
Phyllotaxy is whorled i.e. two or more leaves arises at a node and form a whorl . The inflorescence is terminal or axillary, consisting of thyrsiform cymes or compound umbels. The small, more or less fragrant flowers are white, yellow, pink or green and funnel-shaped, growing on a pedicel and subtended by bracts.
The phyllotaxis is usually decussate, rarely whorled (e.g. Fadogia), or rarely seemingly alternate resulting from the reduction of one leaf at each node (e.g. Sabicea sthenula). Characteristic for the Rubiaceae is the presence of stipules that are mostly fused to an interpetiolar structure on either side of the stem between the opposite leaves ...