Jerusalem-artichoke meaning

A North American sunflower (Helianthus tuberosus) having yellow, rayed flower heads and edible tubers.
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The tuber of this plant.
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A tall North American sunflower (Helianthus tuberosus) of the composite family, with potatolike tubers used as a vegetable.
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Such a tuber.
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A variety of sunflower, Helianthus tuberosus, native to North America, having yellow flower heads and edible tubers.
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The tuber of this plant, eaten as a vegetable; the sunchoke.
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Origin of jerusalem-artichoke

Italian girasole, sunflower, mistaken for "Jerusalem" via folk etymology + artichoke