Variation exist in culm length of species of Cenchrus genus. (Hooker, 1897; Shaheen et al., 2011). In present study, they vary in length from 5-45cm. All Cenchrus sp. studied posses membranous ligule, In Cenchrus setigerus Vahl and C. biflorus 3 spikelets present, In C. ciliaris 2 spikelets present and in C. pennisetiformis 2-4 spikelets are observed. However a variability in number of spikelets is earlier suggested by Shaheen et al. (2011). Variation in colour of spikelets also exist among these species.In Cenchrus ciliaris 1-3 nerved glumes are present while in all other species studied 1 nerved glumes present. 5 nerved lemmas are sort of consistent feature of genus Cenchrus. In S. intermedia ligule is a ciliated fringe while in S. verticellata ligule is lacerate membranous.
Avena fatua has stems 28-47cm high, main distinguishing features are floret marked by a horse shoe shaped scar which according to Hubberd (1978) is a mark of point of detachement of spikelet. Phalaris minor is distinguished by membranous ligule, Panicle inflorescence, glumes unequal with dentate margins, lemma having ciliated surface without an awn extension. Polypogon fugax having the marked differences of genus Polypogon. Ligule membranous so far largest in genera of this tribe collected from Thal desert reaching to a length of 3.5mm