Most have a sheath, petiole or leafstalk, and blade.
The petiole is a stalk that connects the blade with the leaf base.
Stipules, a pair of appendages subtending the leaf petiole, are usually present.
As a result, a zone of cells across the petiole becomes softened until the leaf falls.
When only a single blade is inserted directly on the petiole, the leaf is called simple.
In ocotillo (Fouquieria splendens), the blade falls off and the petiole remains as a spine.
Leaves are sometimes armed with spines or marginal teeth on sheath, petiole, or blade, or on all parts.
In ocotillo (Fouquieria splendens; Fouquieriaceae), the blade falls off and the petiole remains as a spine.
Similar to other members of Apocrita, wasps have a narrow petiole, or “waist,” which attaches the abdomen to the thorax.
Veins, which support the lamina and transport materials to and from the leaf tissues, radiate through the lamina from the petiole.
Many palmate and costapalmate leaves have a prominent, often spear-shaped, ridge of tissue at the apex of the petiole known as the hastula.
The petiole, when present, and the leaf base become thickened, and often the latter expands laterally and fully or partially encloses the stem.
Their stems are stout; the venation of the leaves is palmate; and there are tiny glands at the base of the petiole or on the blade; the stipules too are glandular.
A petiole attaches the leaf to the stem and contains vascular tissue that provides a connection from the stem to permit sap to enter the leaf and the products of photosynthesis (carbohydrates) to be transported from the leaf to the rest of the plant.
The edible portion may be a root, such as rutabaga, beet, carrot, and sweet potato; a tuber or storage stem, such as potato and taro; the stem, as in asparagus and kohlrabi; a bud, such as brussels sprouts; a bulb, such as onion and garlic; a petiole or leafstalk, such as celery and rhubarb; a leaf, such as cabbage, lettuce, parsley, spinach, and chive; an immature flower, such as cauliflower, broccoli, and artichoke; a seed, such as pea and lima bean; the immature fruit, such as eggplant, cucumber, and sweet corn (maize); or the mature fruit, such as tomato and pepper.
- the slender stem that supports the blade of a leaf
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The edible portion may be a root such as rutabaga beet carrot and sweet potato a tuber or storage stem such as potato and taro the stem as in asparagus and kohlrabi a bud such as brussels sprouts a bulb such as onion and garlic a petiole or leafstalk such as celery and rhubarb a leaf such as cabbage lettuce parsley spinach and chive an immature flower such as cauliflower broccoli and artichoke a seed such as pea and lima bean the immature fruit such as eggplant cucumber and sweet corn maize or the mature fruit such as tomato and pepper