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 Trapa

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image of plant
Show caption*© Jeff Clark, some rights reserved (CC BY), uploaded by Jeff Clark
1 Fruit 2-horned; fruit crown absent; leaf lower surface reddish or green; petals pink
image of plant
Show caption*© Eric M Powell, some rights reserved (CC BY-NC), uploaded by Eric M Powell
1 Fruit 4-horned; fruit crown prominent; leaf lower surface green; petals white