National Flowers of Canada
The Leaf of Maple is an official symbol of Canada. The maple leaf was first used as a Canadian symbol in early 18th century and till now is depicted on its current and previous flags, the penny, and on the coat of arms.
Each provinces however have their own floral emblems (I don't have knowledge about floral emblem of Nunavut). Floral emblems of Canadian provinces and territories are given below:
Alberta - Wild Rose
Wild rose was chosen the provincial flower of Alberta in 1930.
British Columbia - Pacific Dogwood
The Pacific dogwood (Cornus nuttallii) was adopted in 1956 as British Columbia's floral emblem. It is a native plant that grows wild in coastal areas of southern B.C. all the way to northern California. Its showy flowers also make it a highly prized ornamental but the species is protected by law and it is illegal to pick or remove it. The Pacific dogwood is a tree that grows six to eight metres high and flowers in April and May. In the autumn it is conspicuous for its cluster of bright red berries and brilliant foliage.
Manitoba - Prairie Crocus
The floral emblem of Manitoba and the state flower of South Dakota, Prairie Crocus, is also called Pasque Flower and Prairie Anemone.
New Brunswick - Purple Violet
Newfoundland/Labrador - Pitcher Plant
Pitcher Plant (Sarracenia purpurea). Queen Victoria, more than a hundred years ago, chose the Pitcher Plant to be engraved on a newly minted Newfoundland penny. In 1954, the Newfoundland Cabinet designated this unusual and interesting plant as the official flower of the province. It gets its nourishment from insects that get trapped and drown in a pool of water at the base of the tubular leaves. The flower is wine and green in colour and can be found on bogs and marshes in Newfoundland and Labrador.
Northwest Territories - Mountain Avens
Nova Scotia - Mayflower
Nunavut - None
Ontario - Trillium
Prince Edward Island - Pink Lady's Slipper
Pink Lady's Slippers (Cypripedium acaule)
Québec - Blue Flag Iris
Saskatchewan - Western Red Lily
Yukon - Fireweed