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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Keeley et al., "Notch signaling modulates proliferation and differentiation of intestinal crypt base columnar stem cells," Development (Cambridge, England), vol.
Intestinal Stem Cell Niche Insights Gathered from Both In Vivo and Novel In Vitro Models
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.
Schedorhinotermes longirostris (Isoptera: rhinotermitidae) on Guam adds to assault on the endemic Cycas micronesica
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.
Stem tilting and pseudocephalium orientation in Cephalocereus columna-trajani (cactaceae): a functional interpretation

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