Evening primrose
Common evening primrose, Oenothera biennis, is a herbaceous plant in the evening primrose family, Onagraceae, originally from North America. Its pale yellow flowers open mainly towards the end of the day. Despite the common name, it is not a member of the true primrose family. This description concerns the upright biennial species, whose growth differs from low perennial evening primroses or those with pink flowers.Its life cycle usually extends over two years. A rosette of elongated green leaves first develops close to the ground, followed by a flowering stem in the next season. Leaves along that stem are alternate and narrow, with edges that may be slightly toothed or wavy. The stem is often hairy, sometimes reddish, and can branch towards the top. A flowering plant therefore has a much taller outline than the initial rosette, although its final size depends on growing conditions.Each flower has four petals arranged as…
