Comment:
when Gray (Mem. Amer. Acad. Arts ser. 2, 4:59. 1849) published this name he cited Viscum flavescens Pursh as a synonym, the latter name an orthographic variant of V. flavens Sw., itself a superfluous renaming of V. racemosum Aubl. Usage of "P. flavescens" is correctable to the illegitimate P. flavens Nutt. ex Gray, typified on a South American entity.