File:Mountain bitterbrush, Purshia tridentata, unnamed high-elevation variant (18411023775).jpg
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Summary
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| Description |
mountain bitterbrush, Purshia tridentata, unnamed high-elevation variant, Sierra Nevada, elevation 2745 m (9005 ft). This bitterbrush form is found at higher elevations in (at least) the southwestern portion of the species range, has often been called Purshia glandulosa, and has been a source of confusion between the two species. This form seems to intergrade only with Purshia tridentata, with which it shares flat and relatively thin (though mostly smaller) primary leaves with only narrowly inrolled margins. It gets confused with P. glandulosa because of its tendency toward primary leaves glabrous above with margins often ciliate-glandular, and glands more frequent on the hypanthia and peduncles, as seen clearly on this plant. Purshia glandulosa, on the other hand, appears to be a completely distinct species centered around the Mojave Desert, and characterized by primary leaves strongly thickened and inrolled most of their width, and with upper leaf surfaces always glabrous and glutinous. It appears to flower later where it grows in proximity to P. tridentata, and intermediates have not been found so far. Field observations are ongoing to determine whether mountain bitterbrush warrants a formal scientific name as a variety of Purshia tridentata. Examples and comparisons: <a href="https://www.flickr.com/photos/127605180@N04/15125367974">www.flickr.com/photos/127605180@N04/15125367974</a> <a href="https://www.flickr.com/photos/127605180@N04/16653752647">www.flickr.com/photos/127605180@N04/16653752647</a> <a href="https://www.flickr.com/photos/127605180@N04/16835202736">www.flickr.com/photos/127605180@N04/16835202736</a> <a href="https://www.flickr.com/photos/127605180@N04/16859906822">www.flickr.com/photos/127605180@N04/16859906822</a> <a href="https://www.flickr.com/photos/127605180@N04/16208690804">www.flickr.com/photos/127605180@N04/16208690804</a> |
| Date | |
| Source | mountain bitterbrush, Purshia tridentata, unnamed high-elevation variant |
| 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@N04/18411023775 (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 | 03:47, 29 December 2019 | | 3,648 × 2,736 (6.29 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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