sessile

adjective

(L. sessilis: on what one can sit, sessile) Sitting directly on base withous support, stalk, pedicel, petiole, peduncle or seta; attached or stationary as opposed to free living or motile; when applied to a stigma, indicates that the style is absent, the stigma being `sessile` on the ovary.
For many animals sessile is used in the sense of not being on a stalk; for example, sessile eyes are attached directly to the head instead of being on eyestalks. Acorn barnacles are sessile while gooseneck barnacles are stalked.