A tumbleweed is a dry, round plant that rolls across the ground when blown by the wind. The "tumbleweed" mentioned in Psalm 83:13 and Isaiah 17:13 likely refer to the Palestinian tumbleweed (Gundelia tournefortii). This plant belongs to the thistle family. It is a prickly herb that contains a milky juice. When it dries, it breaks off and rolls across the land, often gathering in large piles in low areas.
Tumbleweed
From Tyndale Bible Dictionary, adapted by Mission Mutual. CC BY-SA 4.0.