A marsh-loving iris,
Yellow Flag often grows among other plant species with similar tall, strap-shaped leaves. It may be identified by its base, where the flat leaves grow one inside another, layered to form a chevron pattern. The leaves of
Yellow Flag are sword-shaped and bright grey-green, each with a slightly raised midrib.
LEAVES : Basal, sword-shaped; bright grey-green.
PLANT HEIGHT : 1–1.5m.
FLOWER SIZE : 7–10cm wide.
FRUIT : Three-parted capsule that splits to reveal hard, irregular orangebrown seeds.
FLOWERING TIME : June–August.
SIMILAR SPECIES : Sweet Flag has tiny flowers; Branched Burreed; Stinking Iris , yellow form, is smaller.
There is no mistaking the showy, brilliant yellow iris flowers. Each is composed of three fall petals with faint brown markings, supported by a green leaf-like spathe, and three erect standard petals that ar smaller, narrower, and unmarked. The large, oblong, drooping fruit capsule dries and splits to reveal neat ranks of orange-brown seeds, a little like niblets of maize.
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