Leaves
A leaf is an organ of a vascular plant, as defined in botanical terms, and in particular in plant morphology. Foliage is a mass noun that refers to leaves as a feature of plants.
Typically a leaf is a thin, flattened organ borne above ground and specialized for photosynthesis, but many types of leaves are adapted in ways almost unrecognisable in those terms: some are not flat (for example many succulent leaves and conifers), some are not above ground (such as bulb scales), and some are without major photosynthetic function (consider for example cataphylls, spines, and cotyledons).
Conversely, many structures of non-vascular plants, or even of some lichens, which are not plants at all (in the sense of being members of the kingdom Plantae), do look and function much like leaves. Furthermore, several structures found in vascular plants look like leaves but are not actually leaves; they differ from leaves in their structures and origins. Examples include phyllodes, cladodes, and phylloclades.
Read more about Leaves: General Nature of Leaves, Large-scale Features (leaf Morphology), Seasonal Leaf Loss, Morphology, Adaptations, Interactions With Other Organisms, Bibliography
Famous quotes containing the word leaves:
“The leaves are all dead on the ground,
Save those that the oak is keeping”
—Robert Frost (1874–1963)
“Fie on the eloquence that leaves us craving itself, not things!”
—Michel de Montaigne (1533–1592)
“A breeze discovered my open book
And began to flutter the leaves to look
For a poem there used to be on Spring.”
—Robert Frost (1874–1963)