Uktzin 3:1-2

Uktzin 3:1

Some things must be rendered susceptible to impurity but they don’t require intention, some things require intention and to be rendered susceptible, some things require intention but don’t need to be rendered susceptible, and some things don’t need to be rendered susceptible and don’t require intention. Any food that is designated for human consumption must be rendered susceptible to impurity but it doesn’t need intention.

Uktzin 3:2

Things that require both intention and to be rendered susceptible: something that was severed from a person, a domesticated or a wild animal, a bird, the carcass of a non-kosher bird, and the fat in villages; all wild vegetables, except for truffles and mushrooms. Rabbi Yehuda says, except for field leeks, pigweed and star of Bethlehem. [Obviously, the Mishna doesn’t call the latter by this modern name.] Rabbi Shimon says except for wild artichoke. Rabbi Yosi says except for tassel hyacinth. [The identities of these plants are subject to dispute.]