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From: Clarksville, TX
Region: Southwest
Topic: Invasive Plants, Non-Natives, Plant Identification
Title: Plant identification
Answered by: Nan Hampton
This sounds like Poncirus trifoliata (Trifoliate orange). It is a native of eastern Asia and considered invasive in many parts of the US. Here are more photos and information.
If this is not your plant and you have photos, please visit our Plant Identification page where you will find links to several plant identification forums that accept photos for identification.

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