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 Ephedra

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1 Plant erect to spreading, to 1 m tall; seed cones with 1 (rarely 2) seeds
1 Plant clambering, vine-like, to 7 m long/tall; seed cones with 2 seeds