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callus: A small, relatively hard covering, outgrowth, or swelling of tissue, esp. in axes of grass (Poaceae) inflorescences just distal to points of eventual disarticulation.[1]
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Example(s): Example sentences from FNA : [1] callus hairs equal to or slightly longer than spikelet; [2] callus shortly setose on sides, or smooth and glabrous;


  1. Categorical Glossary for the Flora of North America Project, by Robert W. Kiger and Duncan M. Porter. 2001. Hunt Institute for Botanical Documentation.