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Mac Donald Oak

Quercus macdonaldii Greene & Kellogg

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Endemic Range

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Quercus macdonaldii has a very restricted distribution to occurrences on Santa Rosa, Santa Catalina and Santa Cruz Islands in the state of California, USA. . Based on molecular genetics analysis, the genus Quercus is estimated to have separated from Castanea about 60 million years ago. Oaks first appear in the fossil record in North America during the Paleogene between 55 to 50 million years b.p. Most interspecific separations occurred within the Quercus species between 22 and three million years ago. During this period, oaks became the most dominant tree type in the Fagaceae family.
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C.Michael Hogan
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C.Michael Hogan. 2012. ''Oak. Encyclopedia of Earth, National Council for Science and the Environment, Washington DC ed. Arthur Dawson; ed.in-chief Cutler J.Cleveland
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Quercus × macdonaldii

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Distribution map for Quercus × macdonaldii,
on the California Channel Islands

Quercus × macdonaldii,[1][3][4] formerly Quercus macdonaldii, with the common names MacDonald's oak and Macdonald oak, is a rare hybrid species of oak in the family Fagaceae.[1]

Distribution

The tree is endemic to the California Channel Islands, on Santa Cruz Island, Santa Rosa Island, and Santa Catalina Island, in Southern California.[3] It is found in chaparral and woodlands habitats in canyons and slopes below 600 metres (2,000 ft).[3]

Taxonomy

The plant was reclassified as Quercus × macdonaldii, a naturally occurring hybrid of Quercus lobata and Quercus pacifica, or possibly other oak species.[3][4][5] Both parents are placed in section Quercus.[6]

See also

References

  1. ^ a b c 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. ^ a b c d Jepson: Quercus × macdonaldii. Retrieved 28 February 2015.
  4. ^ a b USDA: Quercus × macdonaldii. Retrieved 28 February 2015.
  5. ^ 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.
  6. ^ 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.

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Quercus × macdonaldii: Brief Summary

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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.

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