columnar stem

columnar stem

[kə′ləm·nər ‚stem]
(botany)
An unbranched, cylindrical stem bearing a set of large leaves at its summit, as in palms, or no leaves, as in cacti.
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The columnar stem of arborescent cycad species contains concentric cylinders of vascular tissue comprised of soft, parenchymatous xylem tissue and little lignified tissue (Marler et al.