The petiole is the stem or stalk that attatches the leaf to the plant, in the picture above the petiole attaches the maple leaf to the branch of the tree. Without a petiole a plant would be sessile, which would mean the flower or leaf would grow right out of the plant with no stem. Some flowering plants can be classified by their petiole.
Petiole. (n.d.). Retrieved from http://www.cactus-art.biz/note-book/Dictionary/Dictionary_P/dictionary_petiole.htm
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