What are ligule and Stipels?
Thus the stipules may be an adjunct or an appendage of a leaf (A), or an outgrowth of the base (leaf-base)$ of the leaf (B); stipels are secondary stipules associated with leaflets of a compound leaf (A, B); the ligule is an outgrowth of the leaf-sheath (A) or of the sheathing base of the leaf (B), and the leaf-sheath …
What are leaf stipules?
In botany, a stipule is an outgrowth typically borne on both sides (sometimes on just one side) of the base of a leafstalk (the petiole). (In some older botanical writing, the term “stipule” was used more generally to refer to any small leaves or leaf-parts, notably prophylls.)
What is ligule leaf?
A ligule (from Latin: ligula “strap”, variant of lingula, from lingua “tongue”) is a thin outgrowth at the junction of leaf and leafstalk of many grasses (Poaceae) and sedges. A ligule is also a strap-shaped extension of the corolla, such as that of a ray floret in plants in the daisy family Asteraceae.
What is leaf sheath?
noun. botany the basal part of a grass leaf that encircles the stem.
What are Interpetiolar stipules?
Interpetiolar stipule is a stipule which is located on the stem between the petioles of opposite leaves. It is formed because of the fusion of two stipules of opposite leaves. The numbers of leaves present at each node are one and the number of stipules at each node is two. Example: Coffee plant.
What are stipules mention its functions?
A stipule is a modified leaf appendage located just below or sometimes attached to the leaf petiole. They are uncommon in monocots and usually occur in pairs in dicots. Stipules function to protect the emerging leaf or bud. They can be short-lived abscising soon after the leaves mature.
What are stipules and where are they located?
stipule A leafy or linear appendage, found, usually in pairs, at or near the base of the petiole of a leaf. Stipules are often variously patent (i.e. spreading), but may be adpressed to petiole or twig. Occasionally they are amplexicaul (i.e. surrounding and clasping the twig).
What is leaf sheath used for?
Peeled leaf sheaths are used fresh or after drying as packaging material for flowers, betel leaves, fruits, and similar other items in parts of Asia and for lining cooking pits and for wrapping food for cooking or storage in parts of Africa.
What is the function of sheath in a leaf?
Leaf sheaths clasp the culm preventing the shoot from breaking, ensuring the rigidity to grow erectly and to avoid damage of the meristematic tissue. The mechanical influence of leaf sheaths was investigated in members of Poaceae, Juncaceae, and Cyperaceae in the flowering stage.
What is ligule function?
Of the three component organs of the grass leaf – blade, sheath and ligule – the ligule is the least studied and the least understood. Traditionally, it has been assumed to act in a passive way in protecting the culm and leaves that it encloses from the entry of water, dust and harmful spores.
What do stipules and exstipulate mean on a leaf?
Leaf base often contains two small lateral outgrowths called stipules. A leaf with stipules is called stipulate while the one without stipules is termed as exstipulate. In grasses an outgrowth is present between leaf base and lamina. It is called ligule.
What kind of tissue is a ligule on a plant?
A ligule can also be defined as a membrane-like tissue or row of delicate hairs typically found in grasses at the junction of the leaf sheath and blade. The ligule appears to be a continuation of the leaf sheath and encircles or clasps the stem as does the leaf sheath.
Which is the best definition of a stipule?
STIPULES DEFINITION: A stipule is the outgrowth of the hypopodium or leaf base. Ordinarily a stipule is a tiny structure growing on both sides of a leaf at its base, but in many cases they are large and conspicuous or variously modified to discharge special functions.
Is the Culm sheath the same as a leaf?
Leaves are by definition flat organs capable of photosynthesis, yet the culm sheath may be tubular and not even green. Therefore the term leaf is best avoided away from the foliage, with the flattened apical section of all ‘leaves’ being called a blade, whether leafy or not.