We document 48 of the 219 accepted species in Hydrangeaceae. The rest are listed, with their authorities and their identifiers, inside their genus. They have no page of their own because we could not find three openly licensed photographs of them, and a page without evidence is not a page we are willing to publish.
| Genus | Documented | Accepted species |
|---|---|---|
| Hydrangea | 25 | 91 |
| Philadelphus | 10 | 45 |
| Deutzia | 7 | 71 |
| Fendlera | 2 | 3 |
| Fendlerella | 2 | 4 |
| Jamesia | 1 | 2 |
| Whipplea | 1 | 1 |
Real genera, accepted by World Flora Online, for which we have not yet found three commercially licensed photographs of any species. They are listed rather than hidden.