climbing hydrangea n 1: climbing shrub with adhesive aerial roots having opposite leaves and small white flowers in terminal cymes; Himalayas to Taiwan and Japan [syn: {Schizophragma hydrangeoides}] 2: deciduous climber with aerial roots having large flat flower heads [syn: {Hydrangea petiolaris}] 3: deciduous climber with aerial roots having white to creamy flowers in fairly flat heads [syn: {Hydrangea anomala}]