To tell the difference between a stem and a root you need to look at the picture. If there is a vascular cylinder present, then the picture you are looking at is a root. If there is not a vascular cylinder present, but a vascular bundle present, then it is a stem.
To tell the difference between a stem and a root you need to look at the picture. If there is a vascular cylinder present, then the picture you are looking at is a root. If there is not a vascular cylinder present, but a vascular bundle present, then it is a stem.
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