Answer: Dianella tasmanica as the name implies is native to Tasmania and southeastern Australia where it grows in the naturally cooler moist forest and its Aboriginal use was its edible roots and berries. According to the Monrovia web site, the species itself "was likely collected and named by Sir Joseph Dalton Hooker, 1817-1911, the English explorer and plant collector for the botanic gardens at Kew, and would later become director here." Unfortunately, I am unable to determine who identified or developed the variegated forms although I suspect Variegata occurred naturally and the other was then specifically selected as a cultivar for propagation. I'm sorry I can't be more specifically helpful.
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