Yellow Evening Primrose
Oenothera flava
Evening-Primrose family (Onagraceae)
Oenothera flava flowers are 2-4 inches across and so bright that they always catch attention. The long pink flower tube is usually overlooked. Flowers open late in the day and wilt to a gnarled pink mass early the next day. Oenothera flava likes moist areas and it grows there with an abundance of dark green, wavy-edged leaves. Linnaeus named this in 1753 using a name given several thousand years ago by Theophrastus to another in this family. "Flava" is Latin for "yellow." Marcus Jones collected the first specimen of this plant for science in 1894 in Utah.

©2004 Steve Matson