 The foothill oak woodlands around the Central Valley are dominated by blue oak ("Q. douglasii") and gray pine ("Pinus sabiniana").Blue oak woodlands cover about of the state, and of this area about 79%, or , shows no evidence of past cutting of trees.Recent research by the University of Arkansas Tree-Ring Laboratory has studied several unlogged stands of blue oak woodlands, and suggests that the state may harbor over of such old growth forests.