Mertensia is a genus of flowering plants in the family Boraginaceae, commonly known as the bluebell or lungwort. These plants are primarily found in temperate regions of the Northern Hemisphere. They are characterized by their bell-shaped flowers, which can be blue, pink, or purple, and their broad, leafy stems. Mertensia species are often found in moist, shaded areas, such as woodlands and meadows. They are perennial herbs, meaning they live for more than two years, and can be an important part of their ecosystems, providing nectar for pollinators like bees and butterflies.