Ranunculus Acris. Ranunculus acris. Buttercup. Goldcup. Crowfoot. N. O. Ranunculaceae. Tincture of whole plant.   Clinical.-Erysipelas. Fever. Gangrene. Lumbago. Neuralgia. Rheumatism. Ulcers.   Characteristics.-Ranunculus acris is distinguished from R. bulbosus