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Key to Ranunculus, Key A: subgenus Auricomus; section Batrachium (White Water Crowfoots)

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1 Leaves floating, shallowly lobed; receptacles glabrous Ranunculus hederaceus
1 Leaves submersed (or stranded by falling water levels), dissected into filiform segments; receptacles hispid.
2 Leaves firm (not collapsing when removed from water); free petioles much shorter than the dilated stipular base; leaves usually much shorter than the internode above; achene beaks 0.7-1.5 mm long Ranunculus longirostris
2 Leaves flaccid (collapsing when removed from water); free petioles about as long as the dilated stipular base; leaves usually about as long as the internode above; achene beaks 0.1-0.3 (-0.5) mm long Ranunculus trichophyllus

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Key to Ranunculus, Key A: subgenus Auricomus; section Batrachium (White Water Crowfoots)