Leaves of certain plants become wholly or partially modified for defensive purpose into sharp, pointed structures known as spines. Thus, in prickly pear (Opuntia; fig. 4.25) the minute leaves of the axillary bud are modified into spines.

These bud-scales are prominently seen to cover the buds of jack-fruit, different Ficus and Magnolia species, etc. The scales are tough, modified leaves of the nature of calaphylls (discusscd under types of leaves). They may also be modified leaf bases, petioles or stipules.

The structure and function of a leaf can be modified over the course of evolution as a plant adapts to a particular environment. Some leaves may be converted to storage structures below ground (as with a bulb) or into plant defense structures (as with a spine).

Identify common leaf modifications and their functions, including storage leaves, succulent leaves, spines, tendrils, phyllodes, showy bracts, plantlets, and insect traps. The structure and function of a leaf can be modified over the course of evolution as a plant adapts to a particular environment (Figure \(\PageIndex{1}\)).

The buds of many woody plants, especially in temperate or cold climates, are protected by a covering of modified leaves called scales which tightly enclose the more delicate parts of the bud. Many bud scales are covered by a gummy substance which serves as added protection.

May 16, 2024 · Bud scales are modified leaves. They may be hairy or sticky, depending on the species of plant. A common location for a bud scale is on a terminal bud, the bud at the end of a branch which controls dormancy for other buds on the same branch.

Modified Leaves . Adhesive Disc – Modified leaf used as an attachment mechanism. Sometimes referred to as a holdfast (Boston ivy). Bract – Specialized, often highly colored leaf below flower that often serves to lure pollinators (poinsettia, dogwood). Tendril – Modified leaf, stipule, or other plant part usedfor climbing or as an ...

Apr 4, 2012 · The small, brownish, overlapping structures that cover the over-wintering buds of woody plants are modified leaves called bud scales. Note: unopened flowers are called flower buds, but they are not covered with bud scales.

Jan 30, 2024 · Leaves in some species are modified to have different colors and look like petals. Their main function is to attract pollinators. In the case of Bougainvillea sp. , flowers are small and creamy and are found in the middle of three pink petal-like modified leaves known as bracts (Figure \(\PageIndex{1}\)A).

Jul 29, 2019 · Many woody plants growing in cold or temperate climates have bud scales that are modified leaves. These scales tightly enclose a delicate bud, protecting it from harm. Bud scales are sometimes covered in a gummy secretion that provides added protection.