Some say yes, and some say no.
Mind you, we are talking about whether it is kitniyos. No one holds its hametz. Everyone who allows it would hold it needs a hecksher since it is often processed together with grains.
The argument “for” it being non-kitniyos include it isn’t from the same botanical family as grains (but neither beans), and that it is a new world crop (but so is corn).
The argument “against”, meaning for holding it to be kitniyos, include that the raw food is very grain like and that it can be baked into bread (check online to find recipes), and that the South Americans who developed the crop consider it to be a grain.
So ask you personal posek.