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A common upright perennial, with broad grass like leaves, growing up to about 1-metre, or greater, in height. It habits the edges of ponds, riverbanks and other wet areas. The flowers are split into 3 large separated yellow petals, along with 3 smaller sepals, although as these are all the same colour they are typically referred to as tepals. The larger petals have fine dark orange-purplish stripes at the base. The flowering period is from May to August. Its scientific name is Iris pseudacorus and it also has another common name of Flag Iris.