Ranunculus repens is a species of flowering plant commonly known as creeping buttercup. It is a perennial herb that grows in moist meadows, pastures, and wetlands. The plant has bright yellow flowers that are small and cup-shaped, with five petals. Some synonyms for Ranunculus repens include creeping crowfoot, sleeping beauty, and sourgrass. This plant is often considered a weed because of its invasive nature and ability to spread quickly in grasslands. It is also known for its toxic properties, as it contains a substance called ranunculin that can cause skin irritation and blisters if ingested by humans or animals. Despite this, it is still a popular ornamental plant in gardens and landscaping projects.