Verbatim text: Nesom, G. L. 1989d. The separation of Trimorpha (Compositae: Astereae) from Erigeron. Phytologia 67: 61–66.
Author: Nesom, G.L.
Year: 1989d
Title: The separation of Trimorpha (Compositae: Astereae) from Erigeron
Journal: Phytologia
Volume: 67
Pages: 61–66