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Abies grandis Amelanchier alnifolia areas Artemisia tridentata average number blue huckleberry broadcast burning Ceanothus velutinus central Idaho class Pet class clearcuts conifer conifer species cover species Day and Duffy Douglas-fir Douglas-fir/white spirea h.t. efficient in grand efficient seedbeds Engelmann spruce fir/blue huckleberry h.t. fir/blue huckleberry habitat fir/mountain maple h.t. Fir/Mountain Maple Habitat grand fir grand fir habitat grand fir/blue huckleberry grand fir/mountain maple Habitat Type Lodgepole heavy shade huckleberry habitat types lings Maple Habitat Type mineral soil moderate shade moderately efficient moss mats natural regeneration number of seedlings Pachistima percent percentage occurrence Physocarpus malvaceus Pinus ponderosa ponderosa pine Pseudotsuga menziesii Regeneration efficiency residual duff rotten wood Rubus parviflorus safe site component Salix scouleriana sampled scarification scarified sites seed caches seed source seed-tree cuts seedling plots seedling species seedlings occurred seedlings were found shelterwood cuts silvicultural silvicultural method slash Spirea Habitat Type thimbleberry three habitat types Type Lodgepole pine western larch