Как по Английски будет железняк

noun

Any of various plants growing as weeds of cultivated land and typically having tough or wiry stems; specifically (a) black or common knapweed, centaurea nigra (now rare); (b) north american any of several species of the genus vernonia (family asteraceae (compositae)).

noun

Any of various small shrubs or herbs constituting the genus sideritis (family lamiaceae (labiatae)), native chiefly to the mediterranean and used medicinally; frequently with distinguishing word. also: any of several hemp-nettles (genus galeopsis), especially the common hemp-nettle, g. tetrahit, formerly used to treat wounds (now rare).