Synonyms for Hortensia (same or very similar meaning)
WordNet sense 1 (deciduous shrub bearing roundheaded flower clusters opening green and aging to pink or blue):
Hydrangea macrophylla hortensisWordNet sense 2 (very tall branching herb with showy much-doubled yellow flower heads):
golden glow, double gold, Rudbeckia laciniata hortensiaFrom the ODE community, based on WordNetadd/edit