Sorghum arundinaceum is extremely variable, a variability enhanced by human selection of grain races which introgress with the wild species. Variation is continuous and it is doubtful whether formal infraspecific categories are of much value. The species is questionably native in Asia, probably being indirectly introduced as genetic throwbacks from grain Sorghums.
Very little material from our area has been seen, but since Sorghums are so widely cultivated in Pakistan there can be no doubt that this species, as well as Sorghum x drummondii, will, with a little searching, eventually be found in greater quantity.