black salsify vs salsify

black salsify and salsify both are nouns.

Word	Noun	Adjective	Verb	Adverb
black salsify	Yes	No	No	No
salsify	Yes	No	No	No

As nouns, salsify is a hypernym of black salsify; that is, salsify is a word with a broader meaning than black salsify:

black salsify (noun)	salsify (noun)
long black salsify	either of two long roots eaten cooked
perennial south European herb having narrow entire leaves and solitary yellow flower heads and long black edible roots shaped like carrots	Mediterranean biennial herb with long-stemmed heads of purple ray flowers and milky sap and long edible root; naturalized throughout United States
	edible root of the salsify plant