Lawsonia L.
Engl.: lawsonia.

Lawsonia alba:

Lawsonia alba Lam., Lythraceae: See Lawsonia inermis L.

Lawsonia inermis

Lawsonia inermis L.
Engl.: henna, al-henna, al-khanna, Egyptian privet, henne, Jamaica mignonette, mehndi, mendee, smooth lawsonia.
Bot. syn.: Lawsonia alba Lam.

I have no articles for this botanical term, but there might be some for the next level down (if found).