Quercus includes trees or shrubs that can be either deciduous or evergreen. The leaves may be entire, lobed, or toothed. Flowers are not prominent, but they are succeeded by distinctive acorns. Some species may display notable autumn foliage.

Quercus fusiformis

Quercus galeanensis

Quercus gambelii

Quercus garryana

Quercus garryana var. breweri

Quercus geminata

Quercus georgiana

Quercus germana is a medium-sized tree that can reach heights of approximately 15 meters. Its foliage starts as a coppery red before transitioning to green, with leaves measuring about 15 centimeters in length, featuring shallow serrations at the tips. The acorns are substantial and nestled within a textured cup. The leaves have a prolonged presence on the tree, typically shedding just before the emergence of new growth.

Quercus germana

Quercus gilliana

Quercus gilva is a rapidly growing large evergreen tree that can reach heights of up to 30 meters. Its leaves are elongated, featuring subtle serrations on the margins, with a glossy green surface and a creamy underside.

Quercus gilva

Quercus glabrescens is a large evergreen shrub or small tree that can grow to around 10 meters tall. Its leaves are dark green, oblong-elliptic, and glossy, reaching lengths of up to 11 centimeters, with a stiff and leathery texture.

Quercus glabrescens

Quercus glauca is typically a medium-sized evergreen tree, though it often grows as a large, bushy shrub. Its leaves are thick and leathery, displaying a dark green color on the upper surface and a bluish-green hue underneath, with potential bronze or purple tints in younger foliage. In spring, it produces understated catkins, which are succeeded by acorns measuring around 2 cm in length.

Quercus glauca

Quercus glauca from Korea

Quercus graciliformis

Quercus grahamii is a rapidly growing semi-evergreen or deciduous tree that can reach heights of up to 25 meters. Its leaves are slender with distinctively pointed lobes. They initially appear in a copper-red hue, transitioning to green as they mature. These leaves persist through much of the winter, eventually turning yellow and dropping off just before the new foliage emerges.

Quercus grahamii

Quercus gravesii

Quercus greggii

Quercus griffithii is a sizable deciduous tree, reaching heights of up to 25 meters. In spring, its glossy leaves appear in a copper-red hue, maturing to green as the season progresses. The leaves are distinctly toothed along the margins and transition to a yellow-brown shade in autumn prior to their drop.

Quercus griffithii

Quercus grisea

Quercus guyavifolia

Quercus hartwissiana

Quercus havardii

Quercus hemisphaerica

Quercus hinckleyi

Quercus hintonii

Quercus hintoniorum

Quercus hirtifolia

Quercus humilis

Quercus hypargyrea

Quercus hypoleucoides

Quercus ilex is a sizable evergreen tree characterized by its dark, finely fissured bark and a broad, rounded canopy. The leaves are dark green and ovate with a glossy surface, while the underside is pale. Young foliage appears whitish, and the tree produces yellow catkins.

Quercus ilex

Quercus ilex 'Bicton'

Quercus ilex 'Fordii'

Quercus ilex 'Maria'PBR

Quercus ilicifolia

Quercus imbricaria is a deciduous tree that can reach heights of 20 meters. Initially, it has a pyramidal shape, but as it matures, it forms a wide, rounded canopy. The leaves are dark green, glossy, and range from oblong to lance-shaped, measuring up to 18 centimeters in length. These leaves have smooth edges and a bristle tip, transitioning to yellow-brown or reddish-brown during the autumn months. The tree produces solitary acorns that are nearly spherical, nestled within scaly caps.

Quercus imbricaria

Quercus incana Bartram

Quercus infectoria

Quercus infectoria subsp. veneris is a semi-evergreen tree that can reach heights of approximately 16 meters. Its foliage consists of oblong to elliptic leaves, measuring up to 12 centimeters in length, which may have toothed or occasionally wavy margins, and are attached to petioles that can extend to 2.5 centimeters. The tree produces inconspicuous flowers in spring, which may give way to elongated, pointed acorns.

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