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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Mirabilis

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1 Petaloid calyx with a narrow tube 3-4 cm long, the spreading portion to 5 cm in diameter; involucre with 1 flower, not expanding in fruit; [section Mirabilis]
1 Petaloid calyx with a broad tube < 0.5 cm long, the spreading portion < 1.5 cm in diameter; involucre with 3-5 flowers, expanding in fruit; [section Oxybaphus].
..2 Leaves linear to narrowly lanceolate, 0.1-1 cm wide, 7-15× as long as wide
..2 Leaves lanceolate to ovate, 1-8 cm wide, 1-6× as long as wide.
....3 Leaves cordate at the base, 1-2× as long as wide; [introduced, of disturbed habitats]
....3 Leaves cuneate at the base, 2.5-6× as long as wide; [native, of dry sandy or calcareous habitats, sometimes disturbed]
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