• Taxonomic hierarchy:

• Species: Quercus petraea (Sessile Oak)
• Genus: Quercus (oaks)
• Family: FAGACEAE (forest trees)
• Order: FAGALES (forest trees)
• Subclass: EU-DICOTS (dicotyledonous flowering plants)
• Class: MAGNOLIOPSIDA (flowering plants)
• Phylum: TRACHEOPHYTA (vascular plants)
• Kingdom: PLANTAE (plants)
• Domain: Eukaryota (eukaryotes)
• Life: BIOTA (living things)

• Quercus petraea is also a member of:

• Trees with bark of pH 3.8-5.8 - very acid-barked trees (via Quercus)
• Trees with bark of low pH - acid-barked trees (via Trees with bark of pH 3.8-5.8)
• Trees - broadleaved and coniferous trees (via Trees with bark of low pH)
• Ectomycorrhizal broadleaved trees and shrubs - ectomycorrhizal or ectotrophic mycorrhizal broadleaved trees and shrubs (via Fagaceae)
• Ectomycorrhizal trees and shrubs - ectomycorrhizal or ectotrophic mycorrhizal trees and shrubs (via Ectomycorrhizal broadleaved trees and shrubs)
• Broadleaved trees and shrubs - broadleaved trees and shrubs (via Ectomycorrhizal broadleaved trees and shrubs)
• Xylophytes - broadleaved trees, shrubs and woody climbers (via Broadleaved trees and shrubs)
• Trees and shrubs - trees and shrubs, including conifers (via Ectomycorrhizal trees and shrubs)
• Broadleaved trees - broadleaved, frondose or deciduous trees (via Fagales)
• Trees, shrubs, woody and climbing plants - trees, shrubs, subshrubs and climbers, including conifers (via Broadleaved trees)

Notes: This narrow-leafed form is very close to the classical Q. petraea, but the leaf bases being wedge-shaped (cuneate) on one side and lobed on the other indicate some introgression from Q robur.

The following literature was used to identify this find:

• Crawley, M., 2005. The Flora of Berkshire, 1375pp, Brambleby Books