The term PRICKLY-STEMMED PLANT is a 7-letter crossword solution which can be filled in with the word THISTLE. Thistles are a group of flowering plants characterized by sharp prickly leaves and stems. They are native to temperate regions of the Northern Hemisphere, but some species have been introduced to other parts of the world. Thistles are often considered weeds, but they are also cultivated for their attractive flowers and foliage.