| Hydrangeaceae | |
Adamia
| Wall. | Tent. Fl. Napal. 1: 46 | 1826 |
| Hydrangeaceae | |
Broussaisia
| Gaudich. | Voy. Uranie 479 | 1830 |
| Hydrangeaceae | |
Cardiandra
| Siebold & Zucc. | Fl. Jap. 1: 119 | 1839 |
| Hydrangeaceae | |
Carpenteria
| Torr. | Proc. Amer. Assoc. Advancem. Sci. 4: 192 | 1851 |
| Hydrangeaceae | |
Cornidia
| Ruiz & Pav. | Fl. Peruv. Prodr. 53, pl. 35 | 1794 |
| Hydrangeaceae | ** |
Cyanitis
| Reinw. | Flora 8(2, Beil.): 48 | 1825 |
| Hydrangeaceae | |
Cyanitis
| Reinw. ex Blume | Catalogus 68 | 1823 |
| Hydrangeaceae | |
Decumaria
| L. | Sp. Pl. (ed. 2) 2: 1663 | 1763 |
| Hydrangeaceae | |
Deinanthe
| Maxim. | Mém. Acad. Imp. Sci. Saint Pétersbourg, Sér. 7 ser. 7. 10(16): 2 | 1867 |
| Hydrangeaceae | |
Deutzia
| Thunb. | Nov. Gen. Pl. 1: 19 | 1781 [1781] |
| Hydrangeaceae | |
Dichroa
| Lour. | Fl. Cochinch. 1: 301 | 1790 |
| Hydrangeaceae | |
Edwinia
| A. Heller | Bull. Torrey Bot. Club 24(9): 477 | 1897 |
| Hydrangeaceae | |
Fendlera
| Engelm. & A. Gray | Smithsonian Contr. Knowl. 3(5): 77–78, pl. 5 | 1852 |
| Hydrangeaceae | |
Fendlerella
| (Greene) A. Heller | Bull. Torrey Bot. Club 25(12): 626 | 1898 |
| Hydrangeaceae | |
Hortensia
| Comm. ex Juss. | Gen. Pl. 214 | 1789 |
| Hydrangeaceae | |
Hydrangea
| L. | Sp. Pl. 1: 397 | 1753 |
| Hydrangeaceae | ! |
Jamesia
| Torr. & A. Gray | Fl. N. Amer. 1(4): 593–594 | 1840 |
| Hydrangeaceae | |
Kirengeshoma
| Yatabe | Bot. Mag. (Tokyo) 4: 433 | 1890 |
| Hydrangeaceae | |
Neodeutzia
| Small | N. Amer. Fl. 22(2): 161–162 | 1905 [1905] |
| Hydrangeaceae | |
Philadelphus
| L. | Sp. Pl. 1: 470 | 1753 |
| Hydrangeaceae | ! |
Pileostegia
| Hook. f. & Thomson | J. Linn. Soc., Bot. 2: 57 | 1858 |
| Hydrangeaceae | |
Platycrater
| Siebold & Zucc. | Fl. Jap. 1: 62 | 1838 |
| Hydrangeaceae | |
Sarcostyles
| C. Presl ex Ser. | Prodr. 4: 15 | 1830 |
| Hydrangeaceae | |
Schizophragma
| Siebold & Zucc. | Fl. Jap. 1: 58 | 1838 |
| Hydrangeaceae | * |
Syringa
| Tour. ex Adanson | Fam. Pl. 2: 244 | 1763 |
| Hydrangeaceae | |
Whipplea
| Torr. | Pacif. Railr. Rep. 4(5): 90–91, pl. 7 | 1857 |