"low oxygenated wetlands"
Oxygenated which are low, and oxygenated, or "poorly-oxygenated"? They would surely be in wetlands that are "low": that is, close to sea level.
Are there particular conditions they cannot tolerate, such as high sulfur concentrations or high heat?
With this one reproducing asexually, too, it seems a lot of base-of-the-food-chain genus group flora are asexual-only reproducers.
(Snotflora, Marbleflora, Pioneeroots, to choose some especially popular, related examples) It seems a huge opportunity for a genus-level disease or parasite to cause ecological collapse, especially if it affects more than one genus group.