A rhizomatous perennial herb which is grown in gardens and is naturalised in grassy places, by ditches, on banks and on roadside verges. It also occurs as a relic of cultivation. Lowland.
I. spuria was being cultivated in British gardens by 1573 and it is now commonly grown. It was recorded from the wild in 1836 in S. Lincolnshire, where it has sometimes been considered to be native. Its distribution is similar to that shown in the 1962 Atlas. The colony in Dorset was deliberately destroyed in 1972.
Native of Europe and W. Asia; it has a disjunct distribution made up from the ranges of several rather uncommon subspecies.
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