'Pusillus' is a dwarf form of the Grass-leaf sweet flag or Japanese rush, Acorus gramineus. This cultivated form has also been ranked as a variety, Acorus gramineus var. pusillus. It is in the aquarium trade for a long time, but it is mostly regarded as of limited value or not at all suitable as aquarium plant. However it can very well be grown permanently submerged, at least when it is attached to hard materials (see Schulz 2018).
Acorus gramineus 'Pusillus' is often not taller than 10 cm, however it may reach a hight of about 15 cm.
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[widget=aquaticplants/acorus-gramineus-pusillus]Acorus gramineus 'Pusillus'[/widget]