File:Altered andesite popcorn flower, Plagiobothrys glomeratus (34900295965).jpg
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| Description |
altered andesite popcorn flower, Plagiobothrys glomeratus, Nevada, Virginia Range, Geiger Grade, Steamboat Creek - Truckee Meadows drainage, elevation 1630 m (5350 ft). This humble annual Borage is one of a few rare plant species found on (and in this case limited 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 also become dependent on such conditions and often (like this species) don't survive anywhere else. The same acidic soil conditions also allow certain conifer species from the higher and wetter Sierra Nevada to the west to survive at these lower-elevation desert sites, so that these habitat patches are also noticeable by their sparse woodlands of Jeffrey pine (Pinus jeffreyi) and/or ponderosa pine (Pinus ponderosa) rising above the surrounding matrix of sagebrush and pinyon-juniper vegetation. |
| Date | |
| Source | altered andesite popcorn flower, Plagiobothrys glomeratus |
| 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@N04/34900295965 (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 | |
|---|---|---|---|---|---|
| current | 03:25, 29 December 2019 | | 3,648 × 2,736 (6.39 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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