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Quercus × macdonaldii

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(Redirected from Quercus macdonaldii) Species of tree

Quercus × macdonaldii
Leaves from an individual on Santa Cruz Island, California
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fagales
Family: Fagaceae
Genus: Quercus
Subgenus: Quercus subg. Quercus
Section: Quercus sect. Quercus
Species: Q. × macdonaldii
Binomial name
Quercus × macdonaldii
Greene & Kellogg (pro sp.)
Synonyms
  • Quercus dumosa var. macdonaldii (Greene & Kellogg) Jeps.
  • Quercus dumosa subsp. macdonaldii (Greene & Kellogg) A.Camus
Distribution map for Quercus × macdonaldii,
on the California Channel Islands

Quercus × macdonaldii, formerly Quercus macdonaldii, with the common names MacDonald's oak and Macdonald oak, is a rare hybrid species of oak in the family Fagaceae.

Description

The tree is between 5 and 15 meters tall, with scaly bark on the trunk. The twigs are gray and tomentose. The leaves are between 4 and 7 centimeters in length, the blades are oblong to obovate, and adaxially glabrous to sparsely hairy. The petioles are between 3 and 10 millimeters. The fruits cup is between 10 and 20 millimeters long and 6 to 10 millimeters deep. The nuts are between 20 and 35 millimeters long and conic-oblong or ovoid. The flowering time is between the months of March and May.

Distribution

The tree is endemic to the California Channel Islands, on Santa Cruz Island, Santa Rosa Island, and Santa Catalina Island, in Southern California. It is found in chaparral and woodlands habitats in canyons and slopes below 600 metres (2,000 ft).

Taxonomy

The plant was reclassified as Quercus × macdonaldii, a naturally occurring hybrid of Quercus lobata and Quercus pacifica, or possibly other oak species. Both parents are placed in section Quercus. It is considered a species by Greene but derived from hybrids involving Quercus pacifica, Quercus lobata, and possibly others.

See also

References

  1. ^ ITIS Standard Report Page: Quercus X macdonaldii. Retrieved 28 February 2015.
  2. "Quercus × macdonaldii Greene & Kellogg". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2023-02-19.
  3. ^ Jepson: Quercus × macdonaldii. Retrieved 28 February 2015.
  4. ^ USDA: Quercus × macdonaldii. Retrieved 28 February 2015.
  5. ^ "Quercus ×macdonaldii". ucjeps.berkeley.edu. Retrieved 2023-10-10.
  6. Kevin, Nixon (2002). "The oak (Quercus) biodiversity of California and adjacent regions" (PDF). Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in California's Challenging Landscape.
  7. Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017). "Appendix 2.1: An updated infrageneric classification of the oaks" (xls). figshare. Retrieved 2023-02-18.

External links

Taxon identifiers
Quercus macdonaldii


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