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Quercus sadleriana; Deer Oak, Sadler's Oak   

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Quercus sadleriana
Quercus sadleriana
Deer Oak, Sadler's Oak
Photographer: Aaron Schusteff

ID: 0000 0000 0520 0615 (2020-05-15)

Copyright © 2020 Aaron Schusteff

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  • date of photo  Jul 7, 2012
  • location   Near Bear Basin Butte Lookout (Del Norte County, California, US)
  • family Fagaceae
  • notes   

    These photos show leaves and staminate catkins of Quercus sadleriana....a very distinctive species.

    This shrub-sized, evergreen oak is found in the general environs of the Klamath Mountains region of Northwestern California & Southwestern Oregon (see its BONAP county distribution map).

    The somewhat thick & leathery leaves are unlike any other CA oak: large and ovate-elliptic (with no hint of lobing), with a very well-defined & regular venation pattern. There is a single mid-rib, from each side of which emanate (at an acute angle) 10 or more straight, parallel, uniformly-spaced secondary veins...each ending in a single, small (non-spinose) tooth which together form the serrate leaf margin. The species is also unusual among CA oaks in having persistent, densely long-silky stipules...which are clearly visible in the full-size versions of the images here.

    It's believed that Q. sadleriana is an ancient relictual species which formerly had a much larger range but now only persists in the refugium provided by the Klamath Mountains. Studies indicate that the duo of Q. sadleriana and Q. pontica...another shrubby, evergreen, relictual species with a localized modern range in Eurasia (in the environs of Armenia)...comprise a distinct clade within Quercus. According to recent work of McVay, Hipp, & Manos(2017) there is ''unabiguous support'' for the conclusion that:

    ''The sister group relationship of two narrow endemics, one from the Siskiyou and Klamath Mountains of western North America (Q. sadleriana), and the other from the Caucasus Mountains (Q. pontica), forms the earliest branch of the white oaks.''
    The 'white oaks' (or 'Section Quercus'), with over 90 species, form the 2nd largest subtaxon within the genus (e.g. see the species list here). In visual appearance, Q. sadleriana is unlike any other CA white oak (i.e. Q. lobata, Q. garryana, Q. douglasii, Q. berberidifolia, etc....see the list on pg. 5 of Nixon(2002), a nice review of CA oaks). So it's quite remarkable that Q. sadleriana is one of two distantly-disjunct relictual endemics presently considered phylogenetically basal for that large and botanically significant group.
  • photo category: Plant - shrub

  • common names   Deer Oak, Sadler's Oak (photographer)
  • Look for Jepson Manual treatments, maps (University & Jepson Herbaria)
  • View Calflora record for Quercus sadleriana
  • View all photos in CalPhotos of Quercus sadleriana
  • Check Google Images for Quercus sadleriana

  • The photographer's identification Quercus sadleriana has not been reviewed. Click here to review or comment on the identification.

    Using this photo   The thumbnail photo (128x192 pixels) on this page may be freely used for personal or academic purposes without prior permission under the Fair Use provisions of US copyright law as long as the photo is clearly credited with © 2020 Aaron Schusteff. For other uses, or if you have questions, contact Aaron Schusteff arbonius2[AT] (Replace the [AT] with the @ symbol before sending an email.)


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