Firs ("Abies") are about 45-55 species of evergreen trees in the family "Pinaceae". Fir trees can reach heights of 10–80 m tall and trunk diameters of 0.5–4 m when mature. The difference between firs and other members of the pine family is that their needle-like leaves are attached to the twig by a base that resembles a small suction cup, and by erect, cylindrical female cones 5–25 cm long that release the winged seeds. The male cones are normally much smaller and spread through the tree so that the wind can help pollinate the female cones.