Rubus bifrons Vest ex Tratt., Steiermärk. Z. 3: 163 (1821) (syn: Rubus discolor subsp. speciosus (P. J. Müll.) Berher; Rubus fortis Focke; Rubus fruticosus subsp. bifrons (Vest) A. & D. Löve; Rubus speciosus P. J. Müll.);
Europe as per POWO;
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Austria, Belgium, Netherlands, Czech Republic, France, Germany, Switzerland, Hungary, Italy, Poland, Romania, Slovakia, Slovenia, Croatia, Ukraine, USA (I) (Alabama (I), Arkansas (I), District of Columbia (I), Georgia (I), Kentucky (I), Louisiana (I), Massachusetts (I), Missouri (I), Mississippi (I), North Carolina (I), New Jersey (I), New York (I), Oklahoma (I), Pennsylvania (I), Rhode Island (I), South Carolina (I), Tennessee (I), Texas (I), Virginia (I)) as per Catalogue of Life;
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Rubus bifrons from Tahoe, California-GS2301202
4 images.
Rubus bifrons Focke
Very closely related and often interpreted to include R. armeniacus Focke, both have common name Himalayan blackberry, is distinct from R. ulmifolius Schott (Stems glaucous, terminal leaflet of new stems oblong to narrowly obovate, uniformly fine toothed) in stems not being glaucous, terminal leaflet of new stems widely elliptic to obovate, margins unevenly coarsely toothed.
Photographed from Tahoe California, 4-8-2017
References: POWO Catalogue of Life The Plant List Ver.1.1
http://biology.burke.washington.edu/herbarium/imagecollection/taxon.php?Taxon=Rubus%20bifrons
https://plants.ces.ncsu.edu/plants/rubus-bifrons/
