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Plant Focus

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

Scouting and Collecting Rare Oaks in the Trans-Pecos for Ex-Situ Conservation, 2016

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Emily Griswold, Shannon Still, and Andrew McNeil-Marshall

Published May 2018 in International Oaks No. 29: 125–142


In 2016, the UC Davis Arboretum and Public Garden partnered with the Lady Bird Johnson Wildflower Center on a conservation project targeting five rare and threatened oak species native to West Texas. We received a tree gene conservation partnership grant from the American Public Gardens Association and US Forest Service that supported three scouting and collecting trips in spring, summer, and fall. The targets of the project were Quercus carmenensis, Q. depressipes, Q. graciliformis, Q. robusta, and Q. tardifolia. The primary goal of the project was to increase the representation of genetic diversity of these rare taxa in living public garden collections by collecting and distributing acorns sampled from multiple individuals across their range. We also aimed to further document the current distribution of these species by identifying the locations of individuals and populations as well as any current conservation threats.




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Beckman, E. 2017b. Quercus robusta. The IUCN Red List of Threatened Species 2017: e.T34021A88668862. http://dx.doi.org/10.2305/IUCN.UK.2017-2.RLTS.T34021A88668862.en. Downloaded on 10 December 2017.

Beckman, E. 2017c. Quercus tardifolia. The IUCN Red List of Threatened Species 2017: e.T30958A88668914. http://dx.doi.org/10.2305/IUCN.UK.2017-2.RLTS.T30958A88668914.en. Downloaded on 10 December 2017.

Handbook of Texas Online, “Davis Mountains” accessed December 09, 2017, http://www.tshaonline.org/handbook/online/articles/rjd03.

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Nature Conservancy 2013. Davis Mountains Preserve: Saving a ‘Sky Island’ in the Wilds of Far West Texas. https://www.nature.org/ourinitiatives/regions/northamerica/unitedstates/texas/multimedia/davis-mountains-fact-sheet.pdf. Downloaded on 10 December 2017.

Powell, A. Michael. 1998. Trees and Shrubs of the Trans-Pecos and Adjacent Areas. 1st University of Texas ed. Austin (TX): University of Texas Press. 498 p. 

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Warnock, B.H., and P. Koch. 1977. Wildflowers of the Davis Mountains and the Marathon Basin, Texas. Alpine (TX): Sul Ross State University. 276 p.