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 Luffa

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1 Fruits clavate, strongly 10-angled; petals pale yellow; leaves shallowly lobed
1 Fruits cylindric, not angled; petals deep yellow; leaves deeply lobed