These type of plants bear colorful flowers. These would include buttercups, spearworts, water crowfoots, which usually with flowers having 5 to 6 petals. These plants are poisonous in nature.
Ranunculus has over 600 species of plants. You probably mean the bulbs, which produce blooms that resemble cabbage roses. They come in several colors: white, yellow, orange, red, pink, purple.
