Posted: 09/09/2015 at 15:49
Hmmm, I hate to disagree with Nigel Colborn, but if you'd care to click here http://www.memidex.com/hydrangea+shrub
and scroll down to the etymology references you'll see that the first part of the binomial name, hydr- first coined by Linnaeus, refers to hydor or hudor, Greco-Roman for water. The second part of the binomial name comes from angeion which means vessel and refers to the shape of the seed capsules.
Where I think NC has been confused is that he has divided the name in the wrong place, hydra - ngea rather than hydr - angea.
After all,. if you think about it, the word hydrate starts 'hydra' but it doesn't refer to the Greek many-headed Hydra, it refers to water, doesn't it?