

How to identify Northern blue flag iris (Iris versicolor)
Northern blue flag iris, also known as Harlequin blueflag, Poison flag
Northern blue flag iris exhibits striking perennial features, including sword-shaped leaves that can reach up to 3 feet (90 cm) in length. Its vibrant flowers are a mix of blue, purple, and yellow hues, showcasing the 'many-colored' aspect implied by its specific epithet. Blooms typically have six petal-like structures, with three upright standards and three downward-bending falls, displaying a striking symmetry. The bold flowers and contrasting patterns make northern blue flag iris a distinct species among its genus, easily recognizable by its unique and varied coloration.
Sword-shaped leaves up to 3 feet (90 cm) long.
Flowers with 6 petal-like structures, blue, purple, and yellow hues.
Distinct flowers with 3 upright standards and 3 downward-bending falls.
Large flowers up to 4 inches (10 cm) across, in varied colors.
Leaves blue-green, sword-like, up to 2 feet (60 cm) long and glossy.
The leaves of northern blue flag iris are blue-green, sword-like, measuring up to 2 feet (60 cm) long and approximately 1 inch (2.5 cm) wide. They exhibit entire margins and can either stand upright or arch slightly. The texture is smooth, and the leaves have a slightly glossy appearance. These distinctive features, along with their elongated, narrow shape, are key for identifying this plant.
The flowers of northern blue flag iris are large, measuring up to 4 inches (10 cm) across, and feature 6 distinct parts. They comprise 3 outer, spreading or pendent 'falls', and 3 inner, erect 'standards'. The flowers bloom in late spring to early summer and exhibit various colors. They are found in groups of 1 to several (3-5) on a naked stalk that can reach up to 30 inches (76 cm) tall. These striking blooms are essential for the identification of northern blue flag iris.
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Scientific Classification of Northern blue flag iris