A note about common names and the confusion they can cause.
In Australia, South Africa, and elsewhere, the grass known in North America as St. Augustine Grass (Stenotaphrum secundatum) is commonly called Buffalo Grass. Sir Walter Buffalo Grass (Stenotaphrum secundatum 'Sir Walter') is one of a number of cultivated strains intended for use as a turf grass in warm tropical conditions.
In North America, another unrelated turf grass for drier conditions is commonly known as Buffalo Grass or Buffalograss (Bouteloua dactyloides). it too has a number of cultivars.
Other grasses that are sometimes referred to as Buffalo Grass include Anthoxanthum odoratum (syn: Hierochloe odorata), Brachiaria mutica, Megathyrsis maximus (syn: Panicum maximum), and Paspalum conjugatum. This is likely not a complete list.