Arctostaphylos uva-ursi
The most characteristic natural pine forests are those of "pino negro" ("Pinus uncinata") and Scots pine ("Pinus sylvestris"). The former is often associated with "Rhododendron ferrugineum", blueberries, "Salix pyrenaica" and other shrubby species on the subalpine slopes of the Pyrenees. Over less washed limestone soils it is usually accompanied by Savin juniper ("Juniperus sabina L."), common juniper ("Juniperus communis" subsp. "hemisphaerica"), and common bearberry ("[Arctostaphylos uva-ursi]"). Such forests make up the tree line in most of the Pyrenees, reaching 2400 metres.