lemma

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lemma

(lĕm′ə)
n.
The lower of the two bracts that enclose each floret in a grass spikelet.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

lemma

a grass bract that has the appearance of a GLUME and bears a flower in its axil.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005