WordNet (r) 3.0 (2006):

umbrella plant
    n 1: rhizomatous perennial herb with large dramatic peltate
         leaves and white to bright pink flowers in round heads on
         leafless stems; colonizes stream banks in the Sierra Nevada
         in California [syn: umbrella plant, Indian rhubarb,
         Darmera peltata, Peltiphyllum peltatum]
    2: late blooming perennial plant of shale barrens of Virginia
       having flowers in flat-topped clusters [syn: umbrella
       plant, Eriogonum allenii]
    3: African sedge widely cultivated as an ornamental water plant
       for its terminal umbrellalike cluster of slender grasslike
       leaves [syn: umbrella plant, umbrella sedge, Cyperus
       alternifolius]