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]
| 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 | |
| Synonyms[2] | |
| |
on the California Channel Islands
Description edit
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 edit
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 edit
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 edit
- California chaparral and woodlands ecoregion
References edit
- ^ a b c ITIS Standard Report Page: Quercus X macdonaldii. Retrieved 28 February 2015.
- ^ "Quercus × macdonaldii Greene & Kellogg". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2023-02-19.
- ^ a b c d Jepson: Quercus × macdonaldii. Retrieved 28 February 2015.
- ^ a b USDA: Quercus × macdonaldii. Retrieved 28 February 2015.
- ^ a b "Quercus ×macdonaldii". ucjeps.berkeley.edu. Retrieved 2023-10-10.
- ^ 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.
- ^ 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 edit
- 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)
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