Ranunculus L.

Petals yellow. Leaves sometimes divided into linear segments but then 1 mm wide or more and arranged in one plane only Ranunculus
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Leaves lobed or deeply dissected
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Either; sepals reflexed, or fewer than 5
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Petals inconspicuous flowers <5 mm diam. Receptacle glabrous
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Achenes tuberculate, hairy. Petals mostly 5. Blue Mts Moist places. Fl. spring Ranunculus pumiliopumilio
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Achenes smooth, glabrous. Petals mostly 3–4. Blue Mts, introduced to Coast. Moist places. Fl. spring Ranunculus pumiliopolitus