Radogast, I looked up Hydra Flower and could not find these. Is there a scientific name that you know of? Google kept giving me Hydrangea thinking I was misspelling it. ;-)
Not Hydra as in flower - Hydra as in a many headed serpent from Hades.
Heracles and the Hydra
Technically Heracles and the Lernaean Hydra, but heroic Heracles and the Hadean Hydra is more alliterative.