Rhamnus californica Eschsch. ssp. californica
[= Frangula californica ssp. californica]
Annotated by collector, 2014.

Oregon: Jackson County: south of Blackwell Hill in Harris Gulch [see map ] Elev. 1420 ft.
42° 24' 17.2" N, 123° 26.5" W
in ultramafic belt in ravine - south-facing slope. R. californica ssp. tomentella also grows in the gulch, ca. 500' downstream. twigs reddish, leaves dark green adaxially, puberulent abaxially. ** Northernmost known populations of both subspecies Phenology: vegetative.

Frank T. Callahan RCC-1-HG-2014, Dec 6, 2014
SOC, Accession: 23912