old man of the mountains (cleistocactus tupizensis aka oreocereus celsianus) with thorns backlit

plant flower yellow leaf cactus green thorns nature branch food old man mountains cleistocactus tupizensis oreocereus celsianus backlit mountain native high lands andes south america fluffy white hair sunlight celsianus tupizensis botanical decorative prickly natural botany nature argentina bolivia peru backlit cactaceae cacti cactus cleistocactus clump cultivate desert flora floral furry garden green growth ornamental outdoor park perennial plant sharp spike spring stalks stem succulent torch vegetation light