WordNet sense 1 (sage of western North America to Central America having violet-blue flowers; widespread in cultivation):

Salvia lancifolia, Salvia reflexa

WordNet sense 2 (Texas sage having intensely blue flowers):

mealy sage, Salvia farinacea

WordNet sense 3 (blue-flowered sage of dry prairies of the eastern United States):

Salvia azurea

WordNet sense 4 (aromatic shrub of arid regions of western North America having hoary leaves):

big sagebrush, Artemisia tridentata, Seriphidium tridentatum