| Noun | 1. | umbrella plant - 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 Californiaherb, herbaceous plant - a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests | |
| 2. | umbrella plant - late-blooming perennial plant of shale barrens of Virginia having flowers in flat-topped clusterseriogonum - any plant of the genus Eriogonum with small clustered flowers | |
| 3. | umbrella plant - African sedge widely cultivated as an ornamental water plant for its terminal umbrellalike cluster of slender grasslike leavessedge - grasslike or rushlike plant growing in wet places having solid stems, narrow grasslike leaves and spikelets of inconspicuous flowers Cyperus, genus Cyperus - type genus of Cyperaceae; grasslike rhizomatous herbs; cosmopolitan except very cold regions | |