These weeds are mostly 30-80 cm high, have yellow blossoms, rarely white ones. Ranunculus sceleratus is the most poisonous representative of the family. It contains 2.5% of poison, which becomes harmless after being boiled and dried. However, poisoning is not uncommon. The following symptoms appear after oral intake: irritation and inflammation of the digestive system, nausea, vomiting, intensified salivation, diarrhea and shivering. A lethal end is almost impossible. Buttercup is often used in folk medicine against headache, rheumatism, gout, and festering wounds. 
 

Ranunculus repens