LAVA/ PUMICE (127)
(formerly termed Lava Flows)

Geographic Distribution. This cover type is found mostly in southeastern Oregon and the eastern Cascades Mountains.

Structure and Appearance. Surface lava flows that are largely unvegetated (less than 15% vegetation cover). In eastern Oregon, lava flows may be thinly vegetated with sagebrush, primarily big sagebrush (Artemisia tridentata) and annual grasses, especially cheatgrass (Bromus tectorum). The lava flows in the Cascades tend to be largely unvegetated with scattered pockets of soil that are deep enough to sustain vegetation. In these soil pockets, shrubs such as gooseberry (Ribes cereum), or snowbush (Ceanothus velutinus), or conifers, especially lodgepole pine (Pinus contorta) can survive.