. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. STATUS OF "JUNIPERUS OCCIDENTALS" Juniperus occidentalis is sometimes associ- ated with Artemisia tridentata and A. arbus- cula communities throughout much of central and southeastern Oregon. In the High Lava Plains province, its occurrence is related to more mesic microhabitats (Eckert 1957); Ju- niperus is typical of escarpments and rock outcrops, mesic northerly slopes (with Arte- misia arbuscula/Festuca idahoensis communi- ties), and intermittent drainage ways in this area. Soil depth
. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. STATUS OF "JUNIPERUS OCCIDENTALS" Juniperus occidentalis is sometimes associ- ated with Artemisia tridentata and A. arbus- cula communities throughout much of central and southeastern Oregon. In the High Lava Plains province, its occurrence is related to more mesic microhabitats (Eckert 1957); Ju- niperus is typical of escarpments and rock outcrops, mesic northerly slopes (with Arte- misia arbuscula/Festuca idahoensis communi- ties), and intermittent drainage ways in this area. Soil depths are commonly greater under trees than under adjacent Artemisia. In some locales of the High Lava Plains province, Juni- perus occidentalis is sufficiently common that Juniperus associations or phases of shrub- steppe associations are recognized; unique microcommunities and soil properties are as- sociated with the trees (Eckert 1957). A Juni- perus occidentalis belt is recognized at 1,750- to 1,950-meter elevation in the Steens Moun- tains (Hansen 1956); Artemisia arbuscula is its most typical associate there. Juniperus also occurs along the Owyhee River canyon (Head 1959). DESERT OR SALT DESERT SHRUB Communities variously designated as desert shrub, salt desert shrub, shadscale (Atriplex confertifolia), salt sage (Atriplex nuttallii), or saltbush-greasewood (Atriplex-Sarcobatus) have been mapped but described in only gen- eral terms (Shantz and Zon 1924; Poulton 1962; Kuchler 1964; Hansen 1956). These communities are on saline soils and often in- termingled with upland communities domi- nated by Artemisia tridentata. Salt desert shrub communities are most common in the Basin and Range province,where interior drainage and old lakebeds are typical. Important shrubs in these communities can include Grayia spinosa, Atriplex confertifolia, A. nuttallii, Eurotia lanata, Artemisia spines- cens, and Sarcobatus vermiculatus. Grasses sometimes associated with these shrubs in- clude El
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