In botany, sessility (meaning "sitting", used in the sense of "resting on the surface") is a characteristic of plants whose flowers or leaves are borne directly from the stem or peduncle, and thus lack a petiole or pedicel. The leaves of the vast majority of monocotyledons lack petioles.
- Sessility (limnology), organisms anchored to the benthic environment
- Sessility (medicine), tumors and polyps that lack a stalk
- Sessility (zoology), animals that are not able to move about
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