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The petiole is a stalk that attaches a leaf to the plant stem. In petiolate leaves the leaf stalk may be long (as in the leaves of celery and rhubarb), or short (for example basil). When completely absent, the blade attaches directly to the stem and is said to be sessile. Subpetiolate leaves have an extremely short petiole, and may appear sessile.
Chart illustrating leaf morphology terms. The following terms are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (that is, the leaf blade or 'lamina' is undivided) or compound (that is, the leaf blade is divided into two or more leaflets). [1]
Dense cluster of sessile or subsessile flower s or floret s, e.g. a flower head in the daisy family Asteraceae. See pseudanthium. capsule Dry fruit formed from two or more united carpel s and dehiscing when ripe (usually by splitting into pieces or opening at summit by teeth or pores). carduoid
Leaves which have a petiole (leaf stalk) are said to be petiolate. Sessile (epetiolate) leaves have no petiole, and the blade attaches directly to the stem. Subpetiolate leaves are nearly petiolate or have an extremely short petiole and may appear to be sessile. In clasping or decurrent leaves, the blade partially surrounds the stem.
For example, the genus Trillium is partitioned into multiple subgenera, the sessile-flowered trilliums (Trillium subgen. Sessilia ) and the pedicellate-flowered trilliums. The term "sessility" is also used in mycology to describe a fungal fruit body that is attached to or seated directly on the surface of the substrate , lacking a supporting ...
Many chalcidoids have a very short, broad petiole, such that the mesosoma and metasoma are broadly interconnected (sessile), and the petiole may be obscured from view. Conversely, the petiole may be tubular and longer than broad, so that a distinct constriction demarcates the mesosoma from the metasoma, and the metasoma is 'petiolate'.
Trillium petiolatum shows similarities to both T. sessile and T. recurvatum. Of the sessile trilliums, only T. recurvatum and T. petiolatum have petiolate leaves, but apart from this, the two species have little else in common. [9] Based on flower parts and reproductive organs, T. petiolatum appears to be more closely related to T. sessile. [7 ...
The leaves may be either sessile—growing directly from the stem—or petiolate—growing from a leaf-stalk. They are typically confined to the apices of branchlets, branches, or the trunk. In most species, leaves range from slightly hairy to smooth on top and densely hairy to smooth beneath.