Incase anyone else gets confused like I did....
There are Twilight riverbeasts floating in the river at low health with vines sticking out of them, WoW will show them as quest mobs, these are actually the mobs for Fiona's Solution. The ones you want are south, they are dead with target-able Blooming Mandragoa attached to their body.
Quest
Rotting Riverbeasts
A World of Warcraft quest in Shadowmoon Valley. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
The mobs that you need to kill are around the Dyvari Overgrowth. Southeast of The Burial Fields.
The quest does not show up on the map.
Quest is showing up on the wrong location on the map.
The mobs you need to kill spawns at approximately: 51.41, 64.71
Quest facts
The client quest POI data records no map location for this quest, so no map is shown.
Check whether you have already completed this quest
in-game: /run print(C_QuestLog.IsQuestFlaggedCompleted(34996))
Requirements
Read from the Blizzard quest API.
Description
The botani are infecting the local riverbeasts with some kind of strange flesh-eating plant. I fear this infection could spread to our people. If you see any infested riverbeasts, kill the blooming plants that inhabit their bodies... before they kill you.
Community notes from Wowhead · 26 comments
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Reward details
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Reputation: Council of Exarchs +250
Under the leadership of five powerful exarchs, the draenei of Draenor have prospered in a savage world.
Reputation group: Warlords of Draenor.
Other quests in Shadowmoon Valley that reward Council of Exarchs reputation: The Fate of Karabor (+250), Think of the Children! (+250), Into Twilight (+75), A Hero's Welcome (+250), The Clarity Elixir (+250), A Grandmother's Remedy (+250).
Item facts are the current retail client’s (ItemSparse); the specialisations for a pick-one item are the ones the Blizzard quest API lists; faction and currency text is the client’s own. Lowest listed price = the US commodity auction house now.