| | UNITED STATES: Missouri:: St. Louis Co., 2021. |
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Transverse section of petiole photographed with polarizers crossed, showing thickened cells of hypodermal sterome. Photo taken 21 May 2021.
| | Copyright © 2021 by Robbin Moran
(contact: kcn2[at]cornell.edu)
[ref. DOL51089]
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