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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 Argemone

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1 Flowers yellow to cream or bronze; stamens 20-75.
1 Flowers white to pink or pale lavender; stamens > 150.
  2 Sepal horns 6-10 (-15) mm long; flower buds 15-22 mm long; capsules 35-50 mm long
  2 Sepal horns 3-6 (-10) mm long; flower buds 12-18 mm long; capsules 20-40 (-45) mm long.
    3 Sepal horns 3-5 mm long; capsule with surface not obscured by widely spaced prickles 6-8 (-10) mm long
    3 Sepal horns 4-6 (-10) mm long; capsule with surface partly obscured by combination of widely spaced prickles 6-8 (-10) mm long and more numerous shorter and unequal prickles.