Populus grandidentata (big-tooth aspen) petiole cross section with sagittal sections of extra-floral nectaries.
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| hi-res image | Curtis, Lersten, and Nowak 2002 rev. 2015 | ||||
Populus grandidentata (big-tooth aspen) petiole cross section with sagittal sections of extra-floral nectaries. |
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