This handsome alpine cushion plant has dense, gray-green leaves stemless white flowers in spring .   2 " x 6 " . Sun to part shade, well-drained soil, low water. Hardy to -10 degrees F.  Native to Sierra de Segura, Spain.  Caryophyllaceae

Low mat of needle-like foliage smothered with large white flowers in spring.   5" x 15" . Sun to part shade, well-drained soil. Hardy to -20 degrees F.  Native to the Alps and Pyrenees Mountains where it is found in grasslands.  Caryophyllaceae

Dense cushion with tiny green leaves and small, white flowers on short stems in spring.   2 " x 12 " . Sun to part shade, well-drained soil, low water. Hardy to -10 degrees F.  Native to CO,UT,NV.  Caryophyllaceae

Narrow, grasslike leaves and sprays of yellowish-white flowers in summer.   To 6”. Sun well-drained soil, low water.  Hardy to -20 degrees F.   Native the Western US including SE Oregon. Grows in open shrubland.  Caryophyllaceae

This is a very interesting little plant that, when not in bloom, looks something like a miniature mounding conifer.  Evergreen cushion forms silver-gray hummocks with white, star-shaped flowers in summer.   To 6”. Sun to part shade, well-drained soil. Hardy to 0 degrees F. Nice evergreen accent in trough, scree bed or small-scale rock garden.   Native to the mountain slopes of W Asia. Caryophyllaceae

Vigorous evergreen perennial with large white flowers May-Aug. 8” X 12”  Grow in full sun.  Tolerates poor soil and low water.  Use in rock gardens, crevices, borders.   Native to the SW European mountains. Hardy to –30 F.   Caryophyllaceae

Flat mats of needle-like foliage with white flowers in early summer.   3 " x 16 " . Sun to part shade, well-drained soil, low water. Hardy to -40 degrees F.  Western US.  Caryophyllaceae