Serpentbloom
Found in The Barrens, Wailing Caverns.
The Barrens
Item Count Chance 
Serpentbloom quest1 100% Zone Spawns Coordinates The Barrens 59 46.1, 32.7·46.4, 32.5·48.1, 34.0·48.4, 32.4·45.7, 33.8·46.2, 34.4·46.2, 34.7·46.5, 35.6·45.7, 35.3·45.9, 35.2·46.9, 34.7·46.2, 34.7 … Wailing Caverns 26 instance