Cassiope tetragona, commonly known as Arctic Bell Heather, can be found in mountainous areas. These small white flowers which look like bells, are roughly 1/4 inch at the end of a slender stem. The Arctic Bell Heather grows in patches that remain fairly low on the ground.

The leaves have a high resin content, making the plant a good medium to start a fire. The flowers start to blossom in June.

Cassiope tetragona can be infected with the fungus Exobasidium. The parasitic fungus triggers the plant to produce the red swollen leaves, as seen in this series of pictures.