Stipule's

stipule

[stip-yool]
noun Botany.
one of a pair of lateral appendages, often leaflike, at the base of a leaf petiole in many plants.

Origin:
1785–95; < Latin stipula stalk, noun use of feminine of *stipulus firm (recorded in LL); akin to stipes

stipular, adjective
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Collins
World English Dictionary
stipule (ˈstɪpjuːl)
 
n
a small paired usually leaflike outgrowth occurring at the base of a leaf or its stalk
 
[C18: from Latin; see stipe, stipes]
 
stipular
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

stipule
"small appendage at the base of the petiole of a leaf," 1793, from Fr. stipule, from L. stipula "stalk (of hay), straw."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
stipule   (stĭp'yl)  Pronunciation Key 
One of the usually small, paired parts resembling leaves at the base of a leafstalk in certain plants, such as roses and beans.
The American Heritage® Science Dictionary
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