The Book of Job in the Hebrew Bible mentions this vegetable potherb as Jew's mallow.
From the en.wikipedia.org
In some countries, the leaves are eaten as a potherb, and the bark can be used in teas and infusions.
From the orlandosentinel.com
By mid-century it was being sold by seedsmen as a salad green and potherb-and was rapidly becoming a weed in England.
From the theatlantic.com
On Wednesday, health officials said they found high levels of radioactive substances in the mizuna, or potherb mustard, shipped to Kyoto from Ibaraki Prefecture.
From the edition.cnn.com
More examples
Any of various herbaceous plants whose leaves or stems or flowers are cooked and used for food or seasoning
Leaf vegetables, also called potherbs, green vegetables, greens, or leafy greens, are plant leaves cooked and eaten as a vegetable, sometimes accompanied by tender petioles and shoots. ...