In my language (German) they have completely different names. Scorzonera hispanica (black salsify) is called Garten- (garden), Spanische (spanish) or Echte (real) Schwarzwurzel (black root), while Tragopogon porrifolius (purple salsify) is called Haferwurzel (oat root) or Purpur-Bocksbart (purple goatsbeard).
In my language (German) they have completely different names. Scorzonera hispanica (black salsify) is called Garten- (garden), Spanische (spanish) or Echte (real) Schwarzwurzel (black root), while Tragopogon porrifolius (purple salsify) is called Haferwurzel (oat root) or Purpur-Bocksbart (purple goatsbeard).