with …

needles=very long, 2½–6 cm (1–2½ in), and far apart;
needle upper- and undersurface each have two white stripes;
USA West
◼︎ white fir  Abies concolor


needle undersurface=whitish, fragrant;
northern Canada or USA
balsam fir  Abies balsamea


needle undersurface=whitish;
USA ⛰ Appalachia
Fraser fir  Abies fraseri

Learn more about fir genus Abies (Abies spp.)

Part of 🌲︎ cedar / fir / hemlock / larch / pine / spruce  family Pinaceae.   Despite its common name, Douglas fir  Pseudotsuga menziesii is not a true fir  genus Abies.

🗺 Map by county (🇺🇸 USA-48) (color key).

Uses by native peoples
(Ethnobotany database)

Abies hosts caterpillars of 55 species
of butterflies and moths, in some areas.

Firs are known to be a host for (in areas where invasive) balsam woolly adelgid  Adelges piceae, a small wingless invasive insect that infests and kills fir  genus Abies, especially balsam fir  Abies balsamea and Fraser fir  Abies fraseri.

Although some sources say some fir species, in their natural stands, show signs of resistance.

🔍︎ 🔍︎ images Discover Life Encyclopedia of Life Gymnosperm database Michigan Flora Minnesota Wildflowers Flora of North America NRCS PLANTS db Wikipedia