About 15 species of American walnut are native to North America and 3 to East Asia. Our 9 species of American walnut trees are important parts of Missouri's oak and walnut forests and forests. We know that numerous species of American walnut were also found in ancient forests in Europe, North Africa, Asia and North America before the Ice Age. Many species of American walnut have disappeared and today there are 17 species left around the world.
There are two in mainland China and two in Mexico. The other 15 are found in the central hardwood forest of the eastern and southern United States and Canada. There are about 18 species of American walnut trees that comprise the genus Carya. Of those 18 species of this deciduous tree, 12 are native to the United States.
The remaining six are spread across Mexico, Canada, China and India. The genus Carya belongs to the Juglandaceae or walnut family. True walnut trees are more commonly used as wood than walnut trees, because they are considered to be marginally stronger. They have a degree in humanities, specializing in American Indian studies and radical pedagogy from Michigan State University, and are currently pursuing a doctorate in indigenous knowledge and decolonizing education at the University of Toronto.
The fruit of the American walnut tree is an oval nut that is enclosed in a four-valve shell, which opens when ripe. In a reference amount of 100 grams (3.5 oz), dried walnut nuts provide 657 calories and are a rich source (20% or more of the daily value, DV) of several B vitamins and dietary minerals, especially manganese, with 220% of the DV (table). The walnut gall curculus (Conotrachelus elegans) is a true species of weevil that also feeds on the galls of the phylloxera of the galls of the stalk of American walnut leaves. Horned walnut trees tolerate a wide range of conditions, such as drought and acidic or alkaline soils.
We also learned that American walnut trees have flowers that are small yellow-green bunches, which are flowering spikes of trees that are usually hairy, hanging, composed of single-sex, wind-pollinated flowers that bloom in spring. Many organisms, including humans, enjoy feasting on the fruit of certain types of hickory trees, especially walnuts. Each species is named after the bark or nuts unique to its trees (for example, the water walnut is known as Carya aquatica). Unshelled walnuts maintain the enclosure in which angiosperms first develop when they bloom on walnut trees.
In addition, fossilized remains of North American Carya trees have been found on other continents. The tree was beautiful in spring, but what always caught my attention was the myriad colors of its leaves when they were turned over in the fall. Deformed leaves and twigs can fall from the tree in spring, as squirrels break up infected tissue and eat the galls, possibly because of their protein content or because the galls are fleshy and tasty for squirrels. It comes from slow-growing trees that are expensive to grow, and the wood itself requires a long drying time before it can be used.
This species is drought tolerant but not poor drainage and is better in slightly acidic soils, as it does not tolerate alkaline soils and soil salt.