Why are these flowers called Black Eyed Susans? If you think about it, the Black Eye part probably comes from the prominent carpel or pistel. But the Susan part? Well, the plant is Rudbeckia hirta, twith other common names of: Brown-eyed Susan, Brown Betty, Brown Daisy (Rudbeckia triloba), Gloriosa Daisy, Golden Jerusalem, Poorland Daisy, Yellow Daisy, and Yellow Ox-eye Daisy. Wikipedia. It is also the state flower of Maryland. If you believe it, the name came from an American popular song in the early 1700s.