selected vouchers: WTU
Notes: The original Jepson Manual (1951), Abrams's Illustrated Flora of the Pacific States, the most recent Jepson Manual (2012), and Preston (2013) all recognize B. rosea at the rank of species. The primary difference used by these authors to distinguish from B. coronaria is flower color (rose vs. violet-purple) and staminode shape (bottle-shape vs. oblong). Based on specimens at WTU flower color appears less reliable than staminode shape. Whether to treat this taxon at the rank of species, subspecies, or as a synonym of B. coronaria is unclear, however here we follow the predominant treatment for this taxon, which is to recognize it at the rank of species.