Field Guide to Forest Plants of Northern Idaho
![]() ![]() United States Department of Agriculture Forest Service Rocky Mountain Research Station Ft. Collins, CO General Technical Report RMRS-GTR-118-CD February 2004
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Key to Alnus Species1. Female catkins tassel-like, not persistent; pith compressed; twigs round, resin-dotted ... Betula conspectus1. Female catkins cone-like, persistent; pith triangular; twigs slightly angled .... Alnus conspectus (below) Alnus Conspectus
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