Wheatgrass and spirulina are also used as healthful ingredients. Juicing the fine leaves of wheatgrass usually requires a masticating process. Like most plants, wheatgrass contains chlorophyll, amino acids, minerals, vitamins and enzymes. The chaparral features Oregon grape, western fescue, snowberry, bluebunch wheatgrass, and ceanothus. Pure grasslands dominate lower elevations, with bluebunch wheatgrass, Idaho fescue, and Sandberg bluegrass. Grasses include kobresia, spike trisetum, spreading wheatgrass, and tufted hairgrass. The Wallowa and Grande Ronde valleys features grassland containing bluebunch wheatgrass and Idaho fescue. Vegetation is predominantly blue grama, little bluestem, bunchgrass, buffalograss, wheatgrass, and green needleleaf. Indoor-grown wheatgrass is used to make wheatgrass juice powder. The hills and uplands are covered with Idaho fescue, bluebunch wheatgrass, and Sandberg bluegrass. St. John's wort, turmeric, wheatgrass, and willow bark. Other preferred native grasses include Sandberg bluegrass ("Poa secunda") and bluebunch wheatgrass ("Pseudoroegneria spicata"). Common names include couch grass, wildrye and wheatgrass. Pseudoroegneria spicata is a species of grass known by the common name bluebunch wheatgrass. Elymus trachycaulus is a species of wild rye known by the common name slender wheatgrass.