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An oak tree is one of the most common species of trees in the Northern Hemisphere which includes North America. Oak trees come in two major prototypes — red oak trees and white oak trees. Some oak trees have leaves that stay on the tree year-round (evergreen) and others have leaves that drop during dormancy (deciduous), plus they all bear the familiar acorn fruit.
Plant secondary metabolites can be distinguished roughly into three classes of chemical compounds, namely alkaloids, phenolic compounds and terpenes. Each of these broad classes is comprised of many thousands of different individual compounds and this diversity is one of the primary challenges associated with studying the ecological roles of PSM.
The black walnut tree (Juglans nigra) is one of North America’s most valuable and beautiful native trees, but it does have a “dark side.” Here’s what you should know before planting a black walnut in your yard—and all about harvesting and eating walnuts, too.
Taxus baccata is a conifer native to western, central and southern Europe, northwest Africa, northern Iran and southwest Asia. It is the tree originally known as yew, though with other related trees becoming known, it may now be known as common yew, English yew, or European yew.Primarily grown as an ornamental, most parts of the plant are poisonous, and consumption of the foliage can result in.
Wood, in the strict sense, is yielded by trees, which increase in diameter by the formation, between the existing wood and the inner bark, of new woody layers which envelop the entire stem, living branches, and roots.This process is known as secondary growth; it is the result of cell division in the vascular cambium, a lateral meristem, and subsequent expansion of the new cells.
Rudbeckia hirta, commonly called black-eyed Susan, is a North American flowering plant in the sunflower family, native to Eastern and Central North America and naturalized in the Western part of the continent as well as in China.It has now been found in all 10 Canadian Provinces and all 48 of the states in the contiguous United States. Rudbeckia hirta is one of a number of plants with the.
Oak belongs to the genus Quercus which comprises over 600 different species of trees. Most species of oak trees are deciduous with only couple of evergreen forms. Oak trees live on the Northern hemisphere. They can survive in various forests, including those in temperate climates, Mediterranean and tropical areas. Oak trees are prone to fungal diseases that may induce rotting of the inner part.