File:Altered andesite buckwheat, Eriogonum robustum in habitat (35237885676).jpg
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| Description |
altered andesite buckwheat, Eriogonum robustum, Nevada, Virginia Range, Geiger Grade, Steamboat Creek - Truckee Meadows drainage, elevation 1630 m (5350 ft). This distinctive buckwheat is the signature rare species that is endemic to these peculiar "altered andesite" soils in the foothills surrounding the greater Reno-Sparks area of far western Nevada. Deep hydrothermal alteration of these volcanic deposits left behind sulfide minerals, which slowly oxidize to sulfuric acid as they become exposed at the surface. This creates patches of highly acidic (pH 3-4), brownish orange to white soils that are largely barren of vegetation. Those few species that evolve to tolerate these harsh soil conditions enjoy reduced competition from other vegetation, but in this case also become dependent on such conditions and don't survive anywhere else. The same acidic soil conditions also allow a few species more common in the Sierra Nevada to survive on these isolated lower and drier desert sites. This often includes sparse woodlands of Jeffrey pine (Pinus jeffreyi) and/or ponderosa pine (Pinus ponderosa) -- visible here in the background -- that rise above the surrounding matrix of sagebrush and pinyon-juniper vegetation. In fact Eriogonum robustum is closely related to Eriogonum lobbii, a common higher-elevation species of the Sierra Nevada, of which it was once considered a variety. (The two are fully distinct, however, with E. lobbii being a smaller species with prostrate stems and less branched flower heads.) At one time long ago, maybe during a glacial maximum, ancestral populations of Eriogonum lobbii might have occupied both habitats, and then become isolated and diverged genetically on these sites as the post-glacial climate warmed and dried. |
| Date | |
| Source | altered andesite buckwheat, Eriogonum robustum in habitat |
| Author | Jim Morefield from Nevada, USA |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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This image was originally posted to Flickr by Jim Morefield at https://flickr.com/photos/127605180@N04/35237885676 (archive). It was reviewed on 29 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 03:25, 29 December 2019 | | 3,648 × 2,736 (6.99 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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