It's the species of cactus appearing on Arizona's state license plate
The score, 
pretty typical in Arizona's losing war with cactus rustlers: One ... of the state's 
license plates, and the white blossoms that appear on its branch... [DOC] [TLE] Cactus on Arizona's license plates Crossword Clue, Crossword ... [PAR] Answers for Cactus-on-Arizona%27s-license-plates crossword clue.