Eriogonum longifolium var. harperi
 Harper's umbrella plant Eriogonum longifolium Nutt. var. harperi also known as Harper's buckwheat or Harper's umbrella plant is a dicot of the family Polygonaceae found in areas of nutrient-poor shale soils in Alabama Kentucky and Tennessee. It lives inconspicuously in an immature vegetative stage for four or more years before developing a flowering stalk then flowers and dies. It is listed as an endangered species by the state of Tennessee.