About Kalmia microphylla (Hook.) A.Heller
Kalmia microphylla (Hook.) A.Heller is a short shrub, with a maximum observed height of 24 inches, and growth that rarely exceeds 6 feet. It is often easily confused with bog-laurel (Kalmia polifolia) due to their very similar flowers. It can be identified by its clusters of pink or purple, bell-shaped flowers. Each flower has five fused petals that open into a cup shape. The stamens inside the petals respond to visiting landing insects by covering the insects with pollen. This plant produces small, hard, green fruits that are five-chambered capsules. Its leaves are attached oppositely along stems and are evergreen (not deciduous). Leaves are distinctly lanceolate in shape, have rolled edges, a leathery texture, and a dark green color. When young, the plant's branches and twigs are fuzzy; when mature, they become smooth and colored reddish brown to grayish. This is a perennial species that grows actively during spring and summer. It is commonly found in alpine meadows, open wet areas, and bogs. It grows optimally in open heath or shrublands with moist soil. This plant requires soil with very low calcium carbonate levels, as it is intolerant to alkaline conditions. Its natural distribution spans from Alaska to California, and it has expanded across much of northern Canada. All kalmias are very poisonous, as they contain grayanotoxin. Kalmia microphylla has also been used medicinally to make external washes for skin diseases.
