Oak
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An oak is a hardwood tree or shrub in the genus Quercus of the beech family. They have spirally arranged leaves, often with lobed edges, and a nut called an acorn, borne within a cup. The genus is wid
Quercus robur
Quercus robur habit
Illustration of Q. lusitanica showing staminate (left) and pistillate flowers (right)
Catkins of Q. alba containing the staminate or 'male' flowers
Quercus subg. Quercus
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Quercus subgenus Quercus is one of the two subgenera into which the genus Quercus was divided in a 2017 classification. It contains about 190 species divided among five sections. It may be called the
Oak
…leaves or entire leaves with smooth margins. Many deciduous species are marcescent, not dropping dead leaves until spring. Oaks can be grouped into "red oaks" that have soft bristles on their leaves' lobes, and "white oaks" that don't have those bristles. In spring, a single oak tree produces both male and…
1. English Oak
Quercus castanea leaves and acorns
Quercus coccinea
Leaves of Quercus ellipsoidalis