Biology:Quercus × macdonaldii
| Quercus × macdonaldii | |
|---|---|
| |
| Leaves from an individual on Santa Cruz Island, California | |
Scientific 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.)[1]
| |
| Synonyms[2] | |
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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]
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.[5]
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][6] Both parents are placed in section Quercus.[7] It is considered a species by Greene but derived from hybrids involving Quercus pacifica, Quercus lobata, and possibly others.[5]
See also
- California chaparral and woodlands ecoregion
- California coastal sage and chaparral sub-ecoregion
References
- ↑ 1.0 1.1 1.2 ITIS Standard Report Page: Quercus X macdonaldii. Retrieved 28 February 2015.
- ↑ "Quercus × macdonaldii Greene & Kellogg". Plants of the World Online. Royal Botanic Gardens, Kew. http://www.plantsoftheworldonline.org/taxon/urn:lsid:ipni.org:names:216020-2.
- ↑ 3.0 3.1 3.2 3.3 Jepson: Quercus × macdonaldii. Retrieved 28 February 2015.
- ↑ 4.0 4.1 USDA: Quercus × macdonaldii. Retrieved 28 February 2015.
- ↑ 5.0 5.1 "Quercus ×macdonaldii". https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=76906.
- ↑ Kevin, Nixon (2002). "The oak (Quercus) biodiversity of California and adjacent regions". Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in California's Challenging Landscape.. https://www.fs.fed.us/psw/publications/documents/gtr-184/001_Nixon.pdf.
- ↑ 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). https://figshare.com/articles/dataset/Appendix_2_1_________An_updated_infrageneric_classification_of_the_oaks/5547622/1.
External links
- Jepson eFlora treatment of Quercus × macdonaldii
- USDA Plants Profile for Quercus × macdonaldii [berberidifolia × lobata] (MacDonald oak)
- Calflora Database: Quercus × macdonaldii (MacDonald's oak, MacDonald oak)
Wikidata ☰ Q4135943 entry
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