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In page Hypericum mutilum:

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The plant is native to Eastern Canada and the United States, where it occurs in the north from south-eastern Manitoba to southern Ontario to Newfoundland, in the south to Florida, and in the west to Texas.[3] It has been introduced to France in Landes, to Italy in Tuscany, to Poland in Silesia, to Mexico (where it may be partly native), to Honduras, Ecuador, Peru, Brazil, New Zealand, and Hawaii. The populations discovered in France in 1934 and in Italy in 1834 seem to have been established for a long time.[4]