The Blue flag iris (Iris versicolor, also known as the 'wild iris') is a member of the Iris family native to Canada and America. It has been implicated in several poisoning cases of humans and animals who consumed the rhizomes, which have been found to contain a glycoside, iridin. The sap can cause dermatitis in susceptible individuals.
The plant has large swordlike leaves, and large showy blue flowers. The flowers have six lobes, three of which hang downwards and are actually sepals the same colour as the flower, and three which stand erect.
The blue flag is the provincial flower of Quebec, having replaced the Madonna lily which is not native to the province.
The Saltire, the flag of Scotland, with a Pantone 300 coloured field.
At various times colours as light as sky blue or as dark as dark navy have been used (a selection apparently motivated by which colour of blue dye was cheapest at the time), although recent versions have largely converged on the official recommendation of Pantone 300.
Additionally, the blue saltire on white design is featured on the Coat of Arms of Nova Scotia, Canada and its flag, but the blue used for Nova Scotia is generally a light blue.
Blue is used also as a word to denote a sad or melancholy state, as in depression, or simply a state of deep contemplation (however, the phrase "blue skies," referring to sunny weather, implies cheerfulness).
Blue (along with white) is the national color of Israel and the color is seen on the Israeli flag.
Blue is associated with many air forces and navies because of the color of their dress uniforms, while green is associated with armies.
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