WordNet sense 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):

Darmera peltata, Indian rhubarb, Peltiphyllum peltatum

WordNet sense 2 (late blooming perennial plant of shale barrens of Virginia having flowers in flat-topped clusters):

Eriogonum allenii

WordNet sense 3 (African sedge widely cultivated as an ornamental water plant for its terminal umbrellalike cluster of slender grasslike leaves):

Cyperus alternifolius, umbrella sedge