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Clasping the stem, as the bases of certain leaves do.

[Latin amplexus, an embracing; see amplexus + Latin caulis, stem.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Botany) (of some sessile leaves, stipules, etc) having an enlarged base that encircles the stem
[C18: from New Latin amplexicaulis, from Latin amplectī to embrace + caulis stalk]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
These leaves with different shapes can be grouped into two distinct categories; the first one is called ovate and includes basal and petiolate leaves, arranged in the form of a rosette, while the second one, the lanceolate, refers to smaller leaves and amplexicaul leaves that emerge after stem elongation.
Leaves are alternate, sessile, scale-like, entire, sometimes decurrent, from slightly auriculate to amplexicaul or even vaginate, glabrous, mostly with salt-secreting glands.
Sessile and auriculate (or amplexicaul) leaf bases are a highly distinctive feature of M.