Thorny plants are a type of plant that have sharp spines or thorns. The crossword solutions for this term include ACACIA (6 letters), Pyracantha (10 letters), BRIER (5 letters), Thistle (7 letters), ROSE (4 letters), BRIAR (5 letters), HAWTHORN (8 letters), and CACTUS (6 letters). ACACIA is a genus of shrubs and trees belonging to the subfamily Mimosoideae of the family Fabaceae, native to Africa and Australia. Pyracantha is a genus of evergreen shrubs in the family Rosaceae, native to an area extending from Southwest Europe east to Southeast Asia. BRIER is a common name for any of a number of unrelated plants with thorns or prickles. Thistle is a flowering plant in the family Asteraceae, native to temperate regions of the Northern Hemisphere. ROSE is a woody perennial flowering plant of the genus Rosa, native to the temperate regions of the Northern Hemisphere. BRIAR is a common name for any of a number of unrelated plants with thorns or prickles. HAWTHORN is a large genus of shrubs and trees in the family Rosaceae, native to temperate regions of the Northern Hemisphere. CACTUS is a member of the plant family Cactaceae, native to the Americas.