Briarthorn
Found in The Barrens.
The Barrens
Item Count Chance 
Briarthorn1-3 100% 
Swiftthistle1-2 40.0% 
Root Sample quest1 40.0% Zone Spawns Coordinates The Barrens 136 37.5, 15.7·61.4, 54.3·49.5, 57.1·61.4, 40.9·61.3, 47.4·59.2, 51.6·44.6, 49.8·62.2, 8.2·55.4, 8.4·60.1, 7.1·37.3, 26.8·60.4, 10.2 …