Leaf blade leaf stalk. The slender stalk by which a leaf is attached to the stem. It contains a prominent midrib at the center of the leaf blade which is the main vein. From this midrib arise branches called veins. Its generally broad and flat.
The petiole is a stalk that attaches a leaf to the plant stem. In petiolate leaves the leaf stalk petiole may be long as in the leaves of celery and rhubarb short or completely absent in which case the blade attaches directly to the stem and is said to be sessilesubpetiolate leaves have an extremely short petiole and may appear sessile. It is also called the lamina. A stalk or peduncle as that connecting the abdomen and thorax in wasps.
It is in this layer that photosynthesis occurs. It is the stalk like structure which connects the leaf blade to the stem. Many strap shaped leaves essentially have no petiole and are described as sessile. New latin petiolus latin petioluspeciolus probably for pediciolus diminutive of pediculus pedicle.
Some plants also contain another part called stipules. 157 the broomrape family orobanchaceae is an. Few of these enable water transport to the leaf while the other carry food away from the leaf to other parts of the plant. Fern leaves vary in the relationship of the petiole or leaf stalk often referred to as stipe in ferns to the blade the expanded part of the leaf.
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