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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 Acorus

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1 Midvein of the leaves about equally as prominent as 1-5 well-developed lateral veins parallel to the midvein (at least one of the other veins 0.75-1× as wide as the midvein); mature fruits produced; vegetative leaves (0.3-) avg. 0.8 (-1.3) cm wide; vegetative leaf margins planar, not undulate or crisped; flowers 2-3 mm long
1 Midvein of the leaves distinctly more prominent than the other main veins (none of the other veins > 0.6× as wide as the midvein); mature fruits not produced; vegetative leaves (0.5-) avg. 1.2 (-2.0) cm wide; vegetative leaf margins often crisped or undulate; flowers 3-4 mm long
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