Okay, a few things to be addressed here.
Alright, so we have this plant from the Antarctic that uses humans to propagate itself. But I see quite some flaws here. If it needs humans to propagate, it suggests that it is evolved to take advantage of humans and that both species would be exposed to each other. Putting it in the Antarctic is essentially shooting yourself in the foot, for there is little human presence in those lands.
And since you set the origin of the species 400 years ago, it would be before any human set foot there. This could be something worthy addressing, and might improve the work if executed meaningfully.