Pyrola asarifolia, commonly known as liverleaf wintergreen, bog wintergreen or pink wintergreen, is a plant species of the genus Pyrola native to western North America. It is found primarily on forest margins at mid latitude in the Pacific Northwest and northern California. It is so named simply because its leaves maintain their green color through winter. This section is empty. You can help by adding to it. (June 2015)Cultivation. This section is empty. You can help by adding to it. (June 2015)