Examples from literature

• Buttercups, violets, and many other blossoms were in abundance. 
• Poppies and buttercups had taken root in the banks of earth heaped up on either side of the communication trench. 
• The flowers we love best are yellow: the cowslip, the daffodil, the crocus, the buttercup, half the daisy, the honeysuckle, and the loveliest rose. 
• The meadows are yellow with buttercups, and the birds fly out of the gold. 
• They fed in the sunshine with the golden buttercups up above their knees, literally wading in gold, their horns as they held their heads low just visible among the flowers.