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Had it in the polytunnel for a while but lost it.
Neglect, probably.
In my defence, it was back in the days when I was working in London, and only saw the garden in daylight at weekends for half the year. I recommend "The Woody Iridaceae, Nivenia Klattia and Witsenia" by Peter Goldblatt (Timber Press 1993, ISBN: 0-88192-233-1).