| United States. EIS Task Force - 1975 - 734 páginas
...American green alder, thinleaf alder, and several willow species. Thickets may be extremely dense or open and interspersed with reindeer lichens, low heath-type shrubs, or patches of alpine tundra. Other associated plants are Sitka alder, bearberry, crowberry, Labrador tea, spirea, blueberry, and... | |
| United States. National Park Service. Alaska Regional Office - 1985 - 292 páginas
...community. In one type of shrub thicket, dwarf and resin birch, willows, and alder may be extremely dense or open and interspersed with reindeer lichens, low heath-type shrubs, or patches of alpine tundra. Alder is usually found on moister sites and birch on drier sites. Such shrub thickets typically occur... | |
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