Red Hill, off Dandini Blvd., is home to five species of Eriogonum: E. umbellatum var. nevadense, E. sphaerocephalum, E. ochrocephalum, E. strictum var. anserinum and E. robustum. Eriognum robustum is endemic to southern Washoe County and extreme western Storey County, Nevada, in the Virginia and Carson ranges, and on Peavine Mountain and the Red Hill area. It is found in shallow, rocky, highly acidic (pH 3.3-5.5) soils derived from weathering of hydrothermal iron sulfide deposits formed mainly in andesite, and occasionally in rhyolitic or granitoid rocks, on dry, nearly barren ridges, knolls, and gentle to steep slopes on all aspects.

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