Melica tenuis, is a species of grass that can be found in Brazil, Paraguay, Uruguay and Argentinian provinces such as Misioines and Entre Rios.

[1] The species is perennial and caespitose with short rhizomes.

It ligules are 0.1–0.3 millimetres (0.0039–0.0118 in) long with ligular part being densely pubescent and is not persistent.

They are also straight and flat with lower surface being rough and glabrous.

The species' lower glume is 4–5.5 millimetres (0.16–0.22 in) long and wide and is also either obovate or flabelliform and papery-membranous.