Betula alleghaniensis to the thin bark and lack of ability to resprout, it is easily killed by wildfire. Sugar maple ("Acer saccharum") exerts allelopathic effects on seedlings of yellow birch and decreases their growth ability. The inhibitory chemical is exuded from the roots of the sugar maple and has a very short soil half-life, it no longer has effects on birch after 5 days. It is listed as endangered in Illinois. Yellow birch is considered the most important species of birch for lumber and an important hardwood timber tree; as such, the wood of "Betula alleghaniensis" is extensively used for flooring, furniture,
Alnus incana Alnus incana Alnus incana, the grey alder or speckled alder, is a species of alder with a wide range across the cooler parts of the Northern Hemisphere. It is a small- to medium-sized tree tall with smooth grey bark even in old age, its life span being a maximum of 60 to 100 years. The leaves are matte green, ovoid, long and broad. The flowers are catkins, appearing early in spring before the leaves emerge, the male catkins pendulous and long, the female catkins long and one cm broad when mature in late autumn. The seeds are small, long, and