Reinstatement of Spinifex sericeus R.Br. and hybrid status of S. alterniflorus Nees (Poaceae)

Spinifex sericeus R.Br., previously included under S. hirsutus Labill., is reinstated. S. alterniflorus Nees, a hybrid of S. hirsutus Labill. and S. longifolius R.Br., is described. Distinguishing features and a key to the Australian species of the genus are presented; distribution maps are provided.