cactus with long thorns surrounded by blue-purple flowers

america ardous arid barbed blue bojacaiexcl botany bristly bush cactaceae cacti cactus colombia contrast cundinamarca defense defensive desert difficult drought dry extreme flora flowering flowers green habitat hard hole long lycianthes natural nature nightshade paraguay plant potato prickly protection purple rantonnetii rough shaped sharp solanum south spines spiny stem thorns thorny trumpet vegetation