]> Botany [collector note: Jalisco, Mexico, 1965] Pfeifer, Howard William, & Skog, Laurence E. Pfeifer, Howard William, & Skog, Laurence E. H. W. Pfeifer & L. E. Skog H. W. Pfeifer & L. Skog Pfeifer, H. W., & Skog, L. E.