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Plant Focus

Quercus skinneri
Quercus skinneri is a Central American oak, distinguished by the large size of its fruit.

Identifying Evergreen Hybrids in the California Red Oaks

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Al Keuter

Published May 2020 in International Oaks No. 31: 31–36

Abstract

While hybrids between the deciduous Quercus kelloggii and the three evergreen California Red Oaks have been described, hybrids between the evergreen species have not.

An ongoing study described here considers whether differences in acorn maturation time can provide insight into the identification of evergreen × evergreen hybrids.

Preliminary results of this study begun in 2017 are reported here.

Keywords

biennial acorn maturation, annual acorn maturation, Q. kelloggii, Q. agrifolia var. agrifolia, Q. agrifolia var. oxyadenia, Q. wislizeni, Q. parvula var. shrevei

References

Dodd, R.S., and P. Papper. 2019. Disentangling the Phylogenetic Network of the California Red Oaks. International Oaks 30: 203-208.

Dodd, R.S., and Z. Afzal-Rafii. 2004. Selection and Dispersal in a Multispecies Oak Hybrid Zone. Evolution 58(2): 261-269.

Keuter, A. 2017. The Red Oaks of the Bonny Doon Ecological Reserve, Status Report 3 –Morphology and Hybrids. Report provided to the California Department of Fish and Wildlife (unpublished).

Keuter, A., and P.S. Manos. 2019. Agrifoliae: the California Red Oaks. International Oaks 30: 191-208.

Hauser, D.A., A. Keuter, J.D. McVay, A.L. Hipp, and P.S. Manos. 2017. The evolution and diversification of the red oaks of the California Floristic Province (Quercus section Lobatae, series Agrifoliae). American Journal of Botany 104(10): 1-15.

Nixon, K.C. 2002. The Oak (Quercus) Biodiversity of California and Adjacent Regions. United States Department of Agriculture, Forest Service General Technical Report, Pacific Southwest Research Station PSW-GTR-184: 10.