Hickory nut husks are light green throughout the younger stages of development, then change to a dark brown upon maturity, before falling from the hickory tree.   The texture of a hickory nutshell may be smooth, with minimal veining, or considerably irregular and furrowed. Husks split open at the base once the fruit (nut) inside has fully ripened, although some species partially encapsulate the hickory nut even after splitting. Husks vary in thickness from 2 mm to 9 mm, depending on the hickory nut species When separate from the husk, hickory nuts may measure anywhere between 0.5 inch (13 mm) and 2.56 inches (6.5 cm) long and equally as wide, depending on the species. Look for circular, heart-shaped or oblong nuts that are either slightly flat or rounded. Depending on the species, hickory nuts can have any of these shapes. Several hickory species yield a sweet, edible meat, while others yield bitter meat that one should not eat. The inside of a hickory nut's shell is veined, which can make it difficult to remove the nut meat. The 16 species of hickories each product slightly different nuts. Find out which species live in your area so you'll know exactly what to look for and you can determine whether the nuts you find are edible.

How would you rephrase that briefly using Chinese?
要挑选那些木质外壳的山核桃。 测量果壳的大小。 查看果实的形状。 品尝果肉。 寻找果壳内脉络密集的小格子。 学会辨别不同品种的山核桃。