The term 'prickly flower' can be summarized by two crossword solutions: ROSE (4 letters) and teasel (6 letters). A ROSE is a type of flowering shrub that is native to Europe, Asia, and North America. It is known for its prickly stems and fragrant flowers, which come in a variety of colors. Teasel is a biennial plant that is native to Europe and Asia. It has spiny leaves and purple or pink flowers that bloom in the summer.