Scanning arid African or Indian savannas today reveals an improbable invader - the spindly spaghetti cactus dangling stringy arms covered in sharp spines amid acacia trees and drifting sands. This zany, zippy succulent belongs to the exclusively New World Cactaceae family, yet thrives across three distant continents baffling botanists for over a century through improbable oceanic crossings somehow overcome.