An introduced taxon that can occasionally reproduce outside its area of cultivation or captivity, but that cannot maintain itself in the wild because it cannot form viable populations without human intervention, and therefore depends on repeated introductions to maintain itself in the wild. This status includes all taxa categorized as casual alien, subspontaneous, or escaped from cultivation or captivity. This status includes taxa that are strictly domesticated (fauna) or only cultivated (flora).
introduced not established of which cultivated / domestic