The Collaborative International Dictionary
Goat's beard \Goat's beard\, goatsbeard \goatsbeard\n. (Bot.), A weedy European annual with yellow flowers, of the genus Tragopogon; -- so named from the long silky beard of the seeds. One species is the salsify or oyster plant; it is naturalized in US.
Syn: meadow salsify, shepherd's clock, Tragopogon pratensis.
Sleep-at-noon \Sleep"-at-noon"\, n. (Bot.)
A plant ( Tragopogon pratensis) which closes its flowers at
midday; a kind of goat's beard.
--Dr. Prior.
Joseph's flower \Jo"seph's flow"er\ (Bot.) A composite herb ( Tragopogon pratensis), of the same genus as the salsify.
Wikipedia
Tragopogon pratensis (common names Jack-go-to-bed-at-noon, meadow salsify, showy goat's-beard or meadow goat's-beard) is a biennial plant in the Asteraceae family, distributed across Europe and North America, commonly growing in fields (hence its name) and on roadsides. It is found in North America from southern Ontario to Massachusetts; most of England; on the eastern and southern edges of Scotland; and central Ireland but not the coastal edges.
It flowers between June and October and its flowers have a diameter of 3–5 cm. The root and buds are edible, and it has a milky latex.