Kikuyu grass . I am closely familiar for over 35 years, including ecological restoration hands on getting dirty practical removal work in sensitive richly diverse ground vegetation in many places across south-eastern Au.
Ie. to many years trained eyes has, characteristic leaves' sheaths including their patterns of hairs, ligules and veins, leaves' blades visual patterns, rotting leaves and leaves sheaths visual patterns, and so on .
Best to dig this out including all underground rhizomes. Fine roots can get cut off and left as they will die off due to not having growth buds to grow back with.
If you want to prove this yourself with fertile material, you may wait until flowering – the flowering stamens and styles come out hidden between the bases of the leaves out above the leaves' sheathes where these fertile parts grow from –have to check for them – hidden as the name clandestina alludes to.