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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Fewer crypt base columnar stem cells were generated.
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.
Third, the flowers, which are embedded in the pseudocephalium, are also oriented away from the equator, in contrast with other columnar species that produce their flowers on the warmer side of the columnar stem facing the equator.