Red Flowers » 2 Castilleja tenuiflora – Santa Catalina Indian Paintbrush Chamaesyce setiloba – Yuma Sandmat Cirsium arizonicum – Arizona Thistle Cylindropuntia acanthocarpa – Buck-horn Cholla Cylindropuntia arbuscula – Arizona Pencil Cholla Cylindropuntia spinosior – Walkingstick Cactus 2 of 6First<2>Last