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a very large plant genus of family Ranunculaceae; the buttercups. All of them should be regarded as potentially poisonous. The species listed below have been reported as causing poisoning in animals. They contain protoanemonin glycosides which cause abdominal pain, convulsions, stomatitis, diarrhea. See also protoanemonin.
R. abortivus (small-flowered buttercup), R. acris (tall buttercup), R. bulbosus (bulbous buttercup), R. colonorum, R. cymbalaria, R. ficaria (lesser celandine), R. flammula (spearwort), R. inundatus, R. lingua (greater spearwort), R. multifidus, R. parviflorus (small-flowered buttercup), R. pentandrus, R. pumilio, R. repens (creeping buttercup), R. rivularis (R. amphitrichus, river buttercup), R. sceleratus (celery buttercup, cursed crowfoot, poison buttercup), R. sessiliflorus, R. testiculatus (burr buttercup), R. undosus.