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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 Chaerophyllum

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1 Umbellets 6-20 per umbel; biennials, 3-20 dm tall.
..2 Umbellets 15-20 per umbel
..2 Umbellets 6-12 per umbel
1 Umbellets 2-3 per umbel; annuals, 2-9 dm tall.
....3 Fruits 4-5× as long as wide; ribs of the fruit broad, the intervals between the ribs much narrower than the ribs; pedicels expanding upwards in diameter; stem and leaf surfaces mostly pilose
....3 Fruits 2-3× as long as wide; ribs of the fruit narrow, the intervals between the ribs equal to or wider than the ribs; pedicels mostly uniform in diameter; stem and leaf surfaces essentially glabrous.
......4 Fruit glabrous, 6-10 mm long, 1.5-2 mm broad
......4 Fruit densely and finely puberulent, 4.5-6.5 mm long, 2-2.5 mm broad
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