ground-meristem

ground meristem

noun Botany.
an area of primary meristematic tissue, emerging from and immediately behind the apical meristem, that develops into the pith and the cortex.

Origin:
1935–40

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
ground meristem  
The primary meristem in vascular plants that gives rise to the nonvascular tissues, such as cortex, pericycle, and pith. Within the seeds of angiosperms, it surrounds the procambium.
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