It is commonly called a Dutch iris and is a bulb. It is possibly Iris
xiphium or Iris sibirica. Even in my climate, they go dormant sometimes
as early as July.
I happen to prefer bearded iris, Iris germanica, which is a rhizome.
The flowers are larger and last longer than those from bulb iris. They
are evergreen, even through the winter.
David E. Ross
Climate: California Mediterranean, see
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