[explorer.natureserve.org] Habitat, Range: Draba oligosperma is known from western and northern North America, from mountainous areas and from tundra in the far north, it occurs in western Canada and western United States, the range extent is estimated to be 5.3 million square kilometers, and there are over 500 occurrences rangewide, including from many National Forests and from BLM lands in the western United States, and from various National Parks in the United States and Canada. (link added by Mary Ann Machi)