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[[image]] B.S. 22197. Valley of Río Negro. General Roca, Río Negro, Argentina. November 25, 1920. [[image]] 1429. Arid, gravelly hills north of General Roca, Río Negro. November 25, 1920. [[image]] 1430. A yellow-flowered shrub near General Roca, Río Negro. November 25, 1920.