sessile

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sessile

1. (of flowers or leaves) having no stalk; growing directly from the stem
2. (of animals such as the barnacle) permanently attached to a substratum
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

sessile

[′ses·əl]
(botany)
Attached directly to a branch or stem without an intervening stalk.
(zoology)
Permanently attached to the substrate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.