Quercus canbyi

Quercus canbyi (Canby oak, Sierra oak), synonyms including Quercus graciliformis, is a North American species of oak tree.[2]

Quercus canbyi
Quercus canbyi x Q. xalapensis hybrid in Hackfalls Arboretum
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. Lobatae
Species:
Q. canbyi
Binomial name
Quercus canbyi
Synonyms[2]
  • Quercus alamarensis C.H.Mull.
  • Quercus canbyi f. ascendens Trel.
  • Quercus canbyi f. attenuata C.H.Mull.
  • Quercus canbyi f. berlandieri Trel.
  • Quercus canbyi f. concolor Trel. & C.H.Müll.
  • Quercus canbyi f. karwinskii (Trel.) C.H.Mull.
  • Quercus canbyi f. pedunculata C.H.Mull.
  • Quercus canbyi f. setacea C.H.Mull.
  • Quercus canbyi f. subovatifolia C.H.Mull.
  • Quercus graciliformis C.H.Mull.
  • Quercus graciliformis f. parvilobata (C.H.Mull.) C.H.Mull.
  • Quercus graciliformis var. parvilobata C.H.Mull.
  • Quercus graciliramis C.H.Mull.
  • Quercus karwinskii Trel.

Description

Quercus canbyi is a semi-evergreen - evergreen tree,[3] up to 40–50 feet (12–15 metres) tall in cultivation. Although, it can reach up to 80 feet (24 metres) in the wild in Mexico. It starts as a pyramidal form and then matures into an open irregular shape.[4] It can reach a spread of 30–40 feet (9.1–12.2 metres) wide.[5]

The dark, glossy green leaves are 6–8 inches (15–20 centimetres) long and have serrated edges. The petioles can have a reddish hue.[6] It blooms in March and the acorns are then seen in August.[7][8]

It has been distinguished from Quercus graciliformis by its twig shape and by producing acorns biennially rather than annually;[9] however as of February 2023, Plants of the World Online regards them as synonymous.[2]

Taxonomy

Quercus canbyi was first described by William Trelease in 1924.[2] It is placed in Quercus section Lobatae.[10]

Distribution

The species has been found only in Texas and in northeast Mexico.[2][11]

Conservation

Quercus canbyi was assessed in 2016 for the IUCN Red List as "least concern".[1] Quercus graciliformis, regarded as a synonym by Plants of the World Online, was assessed as "critically endangered" in 2016.[12]

Cultivation

Quercus canbyi will tolerate most kinds of soils and is used in gardens to provide shade.[13]

References
  1. Jerome, D.; Beckman, E. (2018). "Quercus canbyi". IUCN Red List of Threatened Species. 2018: e.T78809316A78809335. doi:10.2305/IUCN.UK.2018-2.RLTS.T78809316A78809335.en. Retrieved 17 August 2022.
  2. "Quercus canbyi Trel. | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 28 February 2023.
  3. Harrison L. Flint Landscape Plants for Eastern North America: Exclusive of Florida and the Immediate Gulf Coast (1997), p. 533, at Google Books
  4. "Quercus canbyi (Chisos Oak, Graceful Oak, Oaks, Sierra Oak, Slender Oak) | North Carolina Extension Gardener Plant Toolbox". plants.ces.ncsu.edu. Retrieved 17 August 2022.
  5. Howard Garrett Plants for Houston and the Gulf Coast (2010), p. 59, at Google Books
  6. "Quercus canbyi (Canby Oak, Sierra Oak)". Mountain States Wholesale Nursery. Retrieved 17 August 2022.
  7. "Quercus canbyi - Trees and Shrubs Online". treesandshrubsonline.org. Retrieved 17 August 2022.
  8. A. Michael Powell Grasses of the Trans-Pecos and Adjacent Areas (1994), p. 94, at Google Books
  9. Jackie M. Poole, William R. Carr and Dana M. Price Rare Plants of Texas: A Field Guide (2007), p. 421, at Google Books
  10. 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. doi:10.6084/m9.figshare.5547622.v1. Retrieved 24 February 2023.
  11. "SelecTree: A Tree Selection Guide". selectree.calpoly.edu. Retrieved 17 August 2022.
  12. Beckman, E. (2017). "Quercus graciliformis". IUCN Red List of Threatened Species. 2017: e.T30954A63729730. doi:10.2305/IUCN.UK.2017-2.RLTS.T30954A63729730.en. Retrieved 16 November 2021.
  13. Howard Garrett Texas Gardening the Natural Way: The Complete Handbook (2010), p. 377, at Google Books

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