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jamesoakchap

תאריך

ינואר 25, 2020 02:22 PM UTC

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eralverson

תאריך

אוגוסט 13, 2008 02:33 PM PDT

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This is one of several documented sites for Canyon live oak at the very northern limit of its range, in the upper portion of the Coast Fork Willamette Watershed SE of Cottage Grove, Lane County.

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cwarneke

תאריך

אוגוסט 6, 2017 01:42 PM EDT

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ravenlunatic

תאריך

מאי 25, 2019 03:21 PM PDT

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Interesting lone individual, between known populations in the Swauk Creek watershed and the Yakima valley?

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katie735

תאריך

יוני 5, 2020 10:43 AM PDT

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harvest20

תאריך

יולי 9, 2020 07:38 PM PDT

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Ground cover

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carexobnupta

תאריך

יוני 6, 2017 01:47 PM PDT

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carexobnupta

תאריך

יוני 9, 2021 11:54 AM PDT

תיאור

Ball Point Terrain
This observation is the highest to date for Q. garryana in the north Oregon Cascades. The geology of the ridge is quite unusual. The USGS web map of the location maps Grande Ronde Basalt but the trail traverses a completely different rock type. The adjacent rock unit is mapped as a silicic vent complex with a minor component of Rhyolite Dacite breccias. The ridge rampart above the observation appears to be basalt. A distinctive ecotone is apparent just above the observation. At the distinctive slope brake the upper vegetation is a dense Ceanothus cover.

The satellite image reviles an open ridge bald at 3900 feet. It is unknown if this is the same formation as this location or if addational oak is present at the higher elevation.

The ridge is composed of a light colored rock. It is poorly consolidated and fractures into small angular rock. The side slopes of the ridge are quite steep with a slope of +45 degrees.

The terrain under the oak woodlands at this location appear not to support the conifers. This provides a completive advantage to the oak at this high elevation.

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carexobnupta

תאריך

אוגוסט 7, 2021 01:27 PM PDT

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This observation is a study and examination of the features of Quercus garryana var. garryana used by the Flora of North America http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=233501033 and the Jepson eFlora https://ucjeps.berkeley.edu/eflora/eflora_keys.php?key=10394 to identify the three Q. garryana varieties.

Typical Oregon White Oak, Quercus garryana var. garryana is a common White Oak across it's range between Vancouver Island in British Columbia and southern California. The taxon is morphologically diverse and frequently recorded on iNaturalist. The sister taxa Q. g. var. breweri and Q. g. semota are much less observed, occur in smaller ranges, and are difficult to identify. Q. g. var. breweri is found in SW Oregon to the central California Coast Range and Q. g. semota found in the Sierra Nevada to the Transverse Range. Although there is uncertainty on the actual range. Mostly this uncertainty is derived from the subtle features that define the taxa.

There is an ongoing discussion of observations from the Siskiyou Range in SW Oregon of Brewer's Oak. It is hoped that this observation can help with the identification of both of the Oregon taxa.

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phabeck

תאריך

יוני 23, 2021 11:50 AM PDT