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1. Seed cones about 1-2 cm long; bracts shorter than scales; needles 1-2.5 cm long, triangular in cross-section..................... Larix laricina 1. Seed cones usually over 2.5 cm long, bracts longer than scales; needles 3-4 cm long. 2. Needles 4-angled in cross-section; young twigs strongly woolly-hairy; cones usually over 3.5 cm long; trees usually at or near timberline..........................Larix lyalli 2. Needles flattened or triangulur in cross-section; young twigs glabrous to somewhat hairy; cones rarely as much as 3.5 cm long; trees of montane forests...................Larix occidentalis Source: The Illustrated Flora of British Columbia.
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