Solanum pinnatisectum, the tansy-leaf nightshade or tansyleaf nightshade, is a species of flowering plant in the family Solanaceae, native to Arizona in the United States, and to Mexico. A wild potato, it is being extensively studied for its resistance to Phytophthora infestans (the cause of late potato blight), in an effort to improve the domestic potato Solanum tuberosum.

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