wild vine: i.e.. plant with vine-like tendrils. Not the grape, but probably the colocynth.
Related Commentaries of 2 Kings 4:39
2 Kings 4:39
39 And one went out into the field to gather herbs, and found a wild vine, and gathered thereof wild gourds his lap full, and came and shred them into the pot of pottage: for they knew them not.