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A stipule is "interpetiolar" if it is located in between the petioles, as opposed to being attached to the petioles, and generally one stipule from each leaf is fused together, so it appears that there's just one stipule between each leaf. [6] A stipule is "intrapetiolar" if it is located in the angle that's between a stem and a petiole. In ...
A stipule, present on the leaves of many dicotyledons, is an appendage on each side at the base of the petiole, resembling a small leaf. Stipules may be lasting and not be shed (a stipulate leaf, such as in roses and beans), or be shed as the leaf expands, leaving a stipule scar on the twig (an exstipulate leaf). The situation, arrangement, and ...
Leaf of Pyrus calleryana with petiole. In botany, the petiole (/ ˈ p iː t i. oʊ l /) is the stalk that attaches the leaf blade to the stem. [1]: 87 [2]: 171 It is able to twist the leaf to face the sun, producing a characteristic foliage arrangement (spacing of blades), and also optimizing its exposure to sunlight.
The leaves are linear to lance-shaped with rolled edges and bristly midribs on the undersides. Each leaf has a large stipule which forms a wide, membranous ochrea. The ochrea is up to 2 centimeters (0.8 inches) long and is persistent, fraying into fibrous, silvery shreds that remain on the plant through the seasons. Flowers occur in the leaf axils.
Prickles on a blackberry branch. In plant morphology, thorns, spines, and prickles, and in general spinose structures (sometimes called spinose teeth or spinose apical processes), are hard, rigid extensions or modifications of leaves, roots, stems, or buds with sharp, stiff ends, and generally serve the same function: physically defending plants against herbivory.
They always have stipules, which can be leaf-like (e.g. Pisum), thornlike (e.g. Robinia) or be rather inconspicuous. Leaf margins are entire or, occasionally, serrate. Both the leaves and the leaflets often have wrinkled pulvini to permit nastic movements. In some species, leaflets have evolved into tendrils (e.g. Vicia). [3] [9] [18]
Stipule sheath: Each leaf has a pair of stipules fused around the branch forming a sheath. The crowding of the leaves results in a pattern of stacked, inverted cones due to the overlapping of the stipule sheaths. On the top of the sheaths on either side of the petiole there are often projections, or spurs.
The white stipule contains a new leaf and a new stipule. Ficus is a pantropical genus of trees, shrubs, and vines occupying a wide variety of ecological niches ; most are evergreen , but some deciduous species are found in areas outside of the tropics and to higher elevations. [ 5 ]