High Quality Content by WIKIPEDIA articles! Epilobium anagallidifolium is a species of willowherb known by the common names pimpernel willowherb and alpine willowherb. This small flowering plant has a circumboreal distribution and can be found in mountain ranges further south, where grows in alpine climates. It is a perennial found in low clumps rarely exceeding 20 centimeters in height. It has wide, rounded basal leaves and narrower leaves further up the stem, and its foliage is often hairy. It bears purple or pinkish trumpet-shaped flowers and the fruit is a capsule two or three centimeters long.