From freshome.com, these 5″ larch floors grace an apartment in Gothenburg, Sweden.  Larch trees are native to the boreal forests of Russia and Canada.  Although they are conifers, they are also deciduous and like the bald cypress lose their needles each season.  Larch is generally similar in appearance to southern heart pine but is usually distinguishable by the small size of knots visible in the lumber.

5" Larch wood floors are used extensively in Swedish interiors.