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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 Hydrilla

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1 Leaves < 5× as long as wide; lower side of the midvein with 0-6 prickles.
1 Leaves > 5× as long as wide; lower side of the midvein with 0 prickles
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