Leaves are alternate compound with more than 11 leaflets.
The butternut, also called white walnut, is found mostly on bottomlands and lower slopes on moist, rich soils.
The pinnately compound leaves are similar to black walnut leaves, being 15 to 30 inches long with 11 to 17 sharp pointed, oblong, finely toothed leaflets 2 to 3 inched long. The leaf stems and leaflets are velvety.
The large, lemon-shaped fruit has a shell which is very rough and sharply ridged, and the kernel is edible. The nut is enclosed in a yellow-green husk with short, rusty, clammy, sticky hairs.
On young branches, the bark is smooth and light gray. On older branches and trunk it breaks into shallow, flat gray ridges which form a diamond-shaped pattern. The underbark is chocolate brown.
This key was developed by "bt" in June 1982. It was put into HTML format by Stephen Ostermiller in July 1997. Copies of the entire guide in zip format that may be taken to camp on a laptop are available to those who write.