Subgenus Quercus. Typical oaks. Widespread; acorns not tightly clustered, with scales on acorn cup arranged in spirals.
Section Quercus (synonym Lepidobalanus). The white oaks. Europe, Asia, north Africa, North America. Styles short; acorns mature in 6 months, sweet or slightly bitter, inside of acorn shell hairless.
Quercus pubescens - Chestnut oak - eastern North America
Quercus pungens - Pedunculate oak, English oak - Europe, West Asia
Quercus stellata - Post oak - eastern North America
Quercus turbinella - Southern live oak # - southeastern North America
Section Mesobalanus. Europe, Asia, north Africa. Styles long; acorns mature in 6 months, bitter, inside of acorn shell hairless (closely related to sect. Quercus and sometimes included in it).
Quercus dentata - Hungarian oak - southeastern Europe
Quercus macranthera - Turkey oak - southern Europe, southwestern Asia
Quercus coccifera - Cork oak # - southwestern Europe, northwestern Africa
Quercus shumardii - Black oak - eastern North America
Quercus wislizenii - Interior live oak # - southwestern North America
Subgenus Cyclobalanopsis. Cluster-acorn oaks. A large group of evergreen oaks in east Asia with clustered acorns and the scales on the acorn cups in distinct concrescent rings (see photo, right); often treated as a separate genus Cyclobalanopsis.
Section Cyclobalanopsis.
Quercus acuta - evergreen foliage ("live oaks") are tagged #. Note that the change from deciduous to evergreen character (or vice-versa) has evolved on numerous occasions in Quercus, and does not necessarily indicate that the species concerned are closely related.
