Iris pseudacorus (Seg, seggan, or seggie) is a species in the genus Iris, o the faimily Iridaceae. It is native tae Europe, wastren Asie an northwast Africae. Its specific epithet, meanin "false acorus," refers tae the similarity o its leaves tae those o Acorus calamus, as thay hae a prominently veined mid-rib an sword-like shape.
It is an yerbaceous flouerin perennial plant, growin tae 1-1.5 m (or a rare 2 m) taw, wi erect leaves up tae 90 cm lang an 3 cm broad. The flouers are bricht yellae, 7-10 cm athort, wi the typical iris fairm. The fruit is a dry capsule 4-7 cm long, containin numerous pale broun seeds.
I. pseudacorus grows baist in very wet condeetions, an is eften common in wetlands, where it tolerates submersion, law pH, an anoxic soils. The plant spreads quickly, bi baith rhizome an watter-dispersed seed. It fills a similar niche tae that o Typha an eften grows wi it, though usually in shallower watter. While it is primarily an aquatic plant, the rhizomes can survive prolonged dry condeetions.
Lairge I. pseudacorus staunds in wastren Scotland fairm a very important feedin an breedin habitat for the endangered Corn Craik.
I. pseudacorus is ane o twa iris species native tae the Unitit Kinrick, the ither bein Iris foetidissima (Stinkin iris).
It is widely planted in temperate regions as an ornamental plant, wi several cultivars selectit for bog gairden plantin. The followin cultivars hae gained the Ryal Horticultural Society's Awaird o Gairden Merit:-
In some regions it haes escaped frae cultivation tae establish itself as an invasive aquatic plant which can create dense, monotypic staunds, ootcompetin ither plants in the ecoseestem. Whaur it is invasive, it is tough tae remove on a lairge scale. Even ploughin the rhizomes is iften ineffective. It haes been banned in some auries but is still widely sauld in ithers for uise in gairdens.
This plant haes been uised as a fairm o watter treatment syne it has the ability tae tak up hivy metals through its ruits.