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From: Nashville, TN
Region: Southeast
Topic: Plant Identification
Title: Identification of thorny tree with lemon-like fruit
Answered by: Nan Hampton
This sounds like Poncirus trifoliata (hardy orange or trifoliate orange), an introduced species from China. It is listed on the Center for Invasive Species and Ecosystem Health Invasive.org website and by TexasInvasives.org. If this isn't the plant you have seen, please take photos and send them to us and we will do our best to identify it. Visit Mr. Smarty Plants' Plant Identification page to read the instructions for submitting photos.
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