noun
1. : cotton grass
2.
a. : a shrubby herb ( Gossypium thurberi ) of southern Arizona and Mexico
b. : any of various cultivated cottons that have escaped and established themselves in subtropical or tropical areas
3. : any of several plants of the genera Abutilon and Hibiscus (especially H. moscheutos )
4. Australia : any of various milkweeds ; especially : either of two milkweeds ( Asclepias fruticosa and A. physocarpa ) that have been introduced into Australia from So. Africa and are poisonous to cattle