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Quercus ilex, the holm oak, [2] [3] also (ambiguously, as many oaks are evergreen) evergreen oak, [4] is a large evergreen oak native to the Mediterranean region. It is a member of the section Ilex of the genus, [ 5 ] [ 6 ] with acorns that mature in a single summer.
Quercus rotundifolia is a medium to large tree, usually 8–12 m (26–39 ft) in height, but can reach up to 15 m (49 ft) with a large, dense, rounded canopy. It has small, leathery, dark-green leaves with a glaucous , densely pubescent underside usually suborbicular to elliptical or lanceolate and are generally spiny to dentate on a younger tree.
Forests include Quercus suber, Pinus pinaster, Quercus pubescens and Castanea sativa too. Supramediterranean vegetation belt, 500– 700 m up to 900- 1,000 m (northern slopes), or 800- 1,000 m to 1,200- 1,350 m (southern slopes); Erica arborea, Quercus ilex, Quercus petraea, Pinus nigra ssp. laricio, Alnus cordata, Ilex aquifolium, Taxus ...
Table 1 gives normal ranges (~10th and ~90th percentiles) for species growing in the field, for well-illuminated leaves. Aquatic plants generally have very low LMA values, with particularly low numbers reported for species such as Myriophyllum farwelli (2.8 g/m 2 ) [ 5 ] and Potamogeton perfoliatus (3.9 g/m 2 ). [ 6 ]
Native ash species, including white ash (pictured), have been declining rapidly this century due to predation by the emerald ash borer. [1]Silvics of North America (1991), [2] [3] a forest inventory compiled and published by the United States Forest Service, includes many hardwood trees.
The genus Quercus contains about 500 known species, plus about 180 hybrids between them. [1] The genus, as is the case with many large genera, is divided into subgenera and sections. Traditionally, the genus Quercus was divided into the two subgenera Cyclobalanopsis, the ring-cupped oaks, and Quercus, which included
Quercus sect. Ilex was first established by John Claudius Loudon in 1838. It has also been treated as a subgenus, under the name Quercus subg. Heterobalanus Oerst., and as subsection. Members may be called ilex oaks. [1] Like all species of Quercus, those of section Ilex are trees or shrubs with acorn-like fruit.
Sclerophyll woodland in Tuscany, Italy. The type of sclerophyllic trees in the Palearctic flora region include the holm oak (Quercus ilex), myrtle (Myrtus communis), strawberry tree (Arbutus unedo), wild olive (Olea europaea), laurel (Laurus nobilis), mock privet (Phillyrea latifolia), the Italian buckthorn (Rhamnus alaternus), etc. [4]