mammillaria cactus macro

above alive areola areolae arid barb barbs beauty botanical botany bumps bumpy cactaceae cacteae cacti cactinae cactoideae cactus caryophyllales circular closeup decorative desert detail dry exotic flora genus green heads macro mammillaria mammillaris many mounds multiple natural nature needle needles nipples numerous ornamental painful pattern pincushion plant points pointy prickly quill quills radial red reddish round sharp species sphere spherical spike spikes spines spiny succulent symmetrical texture thorn thorns top tropical tubercles variety vegetation view viewpoint white