The noun has 2 meanings:

Meaning #1: noxious cress with yellow flowers; sometimes placed in genus Sisymbrium
  Synonyms: yellow rocket, rocket cress, Barbarea vulgaris, Sisymbrium barbarea

Meaning #2: any of several rock-loving cresses of the genus Arabis
  Synonym: rock cress

Rockcress is a common name used for three similar genera of flowering plants in the family Brassicaceae:

• Arabis
• Arabidopsis
• Boechera

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