WordNet (r) 3.0 (2006):

hortensia
    n 1: deciduous shrub bearing roundheaded flower clusters opening
         green and aging to pink or blue [syn: hortensia,
         Hydrangea macrophylla hortensis]
    2: very tall branching herb with showy much-doubled yellow
       flower heads [syn: golden glow, double gold, hortensia,
       Rudbeckia laciniata hortensia]