Stephen A. Spongberg
…species of Erigeron (Compositae). Ph.D. thesis, Department of Botany, University of North Carolina at Chapel Hill. SOURCES: 1. Obituary: Stephen A. Spongberg. Boston Globe, March 19-21, 2021. https://www.legacy.com/us/obituaries/bostonglobe/name/stephen-spongberg-obituary?id=6920519 accessed on…