Primroses are generally herbs or slightly woody plants often found in moist locations. Flowers typically have five petals, five sepals, and five stamens positioned opposite petals. Flowers form in clusters. The family includes pimpernel, primrose, star flower, and loosestrife. But, to keep you on your toes, the family does not include evening primrose and, even though the common name for many members may be loosestrife, they are in the Primrose Family, Primulaceae and not the Loosestrife Family, Lythrum.