OENOTHERA. Evening primrose. The Americas. Rugged perennials of quite variable habit, prized for their abundance of broad-petalled, often fragrant flowers during the warmer months. Many open in the evening and close by mid-morning. However, most of the following are day blooming. Sun, reasonably well drained soil, moderate to little watering when established. Hardiness varies.

missouriensis. A beautiful plant for the rock garden. Several short, prostrate stems radiate from the base, lined with 4" narrow, greyish green leaves. Each stem is tipped by a tight cluster of buds from which brilliant yellow 4" blossoms open successively in summer and fall. ‘Greencourt Lemon’ is distinguished by more silvery leaves and pale yellow flowers. Winter deciduous. Below 0^oF.

rosea. This species makes low mounds 1' or less tall by eventually 2-3' in time. It is closely branched, with slender reddish stems and shiny dark green 1-2" leaves. In summer it bears many rose pink blossoms, about 3/4" across in our material, opening during the day. It should be hardy to 15^oF or less.

tetragona. This species forms permanent clumps of basal rosettes with broad, pointed, shiny 2" leaves, evergreen for us but perhaps winter deciduous in colder climates. Leafy 1-2' blooming stems rise from the rosettes in spring and summer, bearing a wealth of brilliant yellow 1½" blossoms. Probably 0^oF or below.