Definition of goat's-beard
1a plant of the daisy family, with slender grasslike leaves, yellow flowers that typically close at about midday, and downy fruits that resemble those of a dandelion. Native to Eurasia, it has become established in eastern North America.
- Tragopogon pratensis, family Compositae
2a plant of the rose family, with long plumes of white flowers, found in both Eurasia and North America.
- Aruncus vulgaris, family Rosaceae