Flora of the Southeastern United States
2022 Edition

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Key to Ranunculus, Key C: subgenus Auricomus; section Auricomus

1 Achene beaks (0.6-) 0.7-1.0 mm long; petals < ½ as long as the sepals; sepals hirsute
1 Achene beaks 0.1-0.3 mm long; petals > ½ as long as the sepals; sepals glabrous to sparsely long-villous.
..2 Petals 4-8 mm long, longer than the sepals
..2 Petals 1.5-3.5 mm long, slightly shorter than the sepals.
....3 Leaves and stems glabrous or nearly so (or the upper stem puberulent); basal leaves 1-6 (-10) cm wide, reniform to cordate at the base; roots usually all filiform; receptacle surface (with achenes removed or fallen off) pubescent (at least sparsely so); achenes shiny
....3 Leaves and stems villous, at least sparsely so and at least toward the base of the plant; basal leaves 1-2.5 cm wide, truncate to cuneate (rarely cordate) at the base; roots sometimes in part fusiform-thickened; receptacle surface glabrous; achenes dull