There are two plants in my garden right now with connections to characters in Homer's Iliad. They are yarrow and elecampane.
Elecampane, or Inula helenium, is said to have been brought to Troy by Helen. I don't know why Helen brought it with her. Perhaps it was because of its sunny, yellow flowers. Or maybe Helen suffered from asthma, or from frequent upper respiratory infections. A tea made with elecampane will help relieve both of those things. Today, there are more effective ways to treat asthma, but I include elecampane in teas to help relieve colds and flu and it works extremely well. You can see a picture of it in my garden here, and blooming in the wild here. It won't bloom until round about late July/August.
Yarrow, or Achillea millefolium, is said to have been used by Achilles to treat the wounds of his men. It's helpful in stopping blood flow from wounds, and is antiseptic as well. It is also an antispasmodic so I not only include it in healing salves that I make, but in salves to rub on tight muscles. Even my husband, the habitual skeptic, has been converted to using my yarrow and goldenrod salve when he has a stiff neck. He even asks for it. That alone tells me that it works.
I gather yarrow from the wild and I've raised it from seed. It's a nice, white flower with feathery greens, but there are many cultivars around that have rich colors. The original white, however, is the best medicinally.
But you can see where the colors come from. In any typical grouping of white yarrow:
There will be the odd head with a touch of color:
By selectively breeding those with touches of color, eventually you will end up with something like this: