Hi, I am making a research on a plant (Polygonum tinctorum), and I was given other names for it. like Persicaria tinctoria (Aiton) Spach & Pogalis tinctoria (Aiton) Raf.
What is the meaning of "Aiton", Spach. and Raf.? I can't find any botanical references in dictionaries or Internet. The meaning they give me don't make any sense.