Black-eyed Susan is the fitting name for flowers with bright yellow petals around a dark center eye. The name is applied to two very different plants. Thunbergia alata is a vining, heat-loving ...

What’s a Black-Eyed Susan? A plant, a horse race, and a cocktail — the big three. The Rudbeckia hirta — the plant’s scientific name — resembles a sunflower with its bright-yellow petals.