Found this using Allakazham's "Item Lookup" found on the left hand side of the page.
It's the listing for moonpetal lily. If you click on the quest it will bring up the quest page which includes a description of the quest and the text that explains where the lilies are found. http://wow.allakhazam.com/item.html?witem=10641
Omusa - 66 Tauren Hunter - Illidan
Diafp - 17 Blood Elf Mage - Illidan
Seoman - 70 Dwarf Warrior - Anetheron
Seomusa - 26 Draenai Shaman - Anetheron
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