Question: This vine was growing on a bush in our backyard in Cape Elizabeth, Maine. It looks like a blackberry vine …
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Question
This vine was growing on a bush in our backyard in Cape Elizabeth, Maine. It looks like a blackberry vine to me, but I was flummoxed by the pentagonal cross section of the woody stem. Your thoughts?
Answer
Dear JOANINMAINE, good morning. The plant is indeed a blackberry (Rubus subgenus Rubus). The angled stems are very common on the larger-stemmed species of this genus. I can't tell you for certain who this is exactly (i.e., which blackberry) without more information, but hopefully receiving confirmation of your hypothesis will be useful to you.
