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Sessility (botany)

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Leaves or flowers that grow directly from the stem or peduncle of a plant

The perennial wildflowerTrillium cernuum possesses three leaves that are sessile at the top of the stem.

Inbotany,sessility (meaning "sitting", in the sense of "resting on the surface") is a characteristic of plant organs such as flowers or leaves that have no stalk.^[1]^[2] Plant parts can also be described assubsessile, that is, not completely sessile.

A sessile flower is one that lacks apedicel (flower stalk). A flower that is not sessile ispedicellate. For example, the genusTrillium is partitioned into multiple subgenera, the sessile-flowered trilliums (Trillium subgen. Sessilia) and the pedicellate-flowered trilliums.

The term "sessility" is also used inmycology to describe a fungalfruit body that is attached to or seated directly on the surface of thesubstrate, lacking a supportingstipe orpedicel.^[3]

References

[edit]

^Beentje, H.; Williamson, J. (2010).The Kew Plant Glossary: an Illustrated Dictionary of Plant Terms. Royal Botanic Gardens, Kew: Kew Publishing.
^Hickey, M.; King, C. (2001).The Cambridge Illustrated Glossary of Botanical Terms. Cambridge University Press.
^Ulloa, Miguel; Halin, Richard T. (2012).Illustrated Dictionary of Mycology (2nd ed.). St. Paul, Minnesota: The American Phytopathological Society. p. 575.ISBN 978-0-89054-400-6.

Botany

Subdisciplines

Plant groups

Plant anatomy

Plant morphology
(glossary)

Plant cells	Cell wall Phragmoplast Plastid Plasmodesma Vacuole
Tissues	Cork Ground tissue Mesophyll Meristem Storage organs Vascular tissue Vascular bundle Wood
Vegetative	Bulb Root Rhizoid Rhizome Shoot Bud Leaf Cataphyll Petiole Sessility Stem
Reproductive (incl. Flower)	Archegonium Antheridium Androecium Pollen Stamen Anther Filament Staminode Tapetum Flower Aestivation Flower development Floral diagram Floral formula Floral symmetry Whorl Fruit Anatomy Berry Capsule Nut Pyrena Seed Dispersal Endosperm Gametophyte Gynandrium Gynoecium Carpel Ovary Locule Ovule Stigma Style Hypanthium (Floral cup) Inflorescence Bract Pedicellate Raceme Umbel Perianth Tepal Petal Sepal Plant embryo Receptacle Sporophyll Sporophyte
Surface structures	Cuticle Epicuticular wax Epidermis Nectar Stoma Thorns, spines, and prickles Trichome