Ophiopogon japonicus

Ophiopogon japonicus kyoto dwarf is as its name suggests a dwarf variety of japonicus. This compact plant is slow growing and tolerant of most conditions.

Ophiopogon japonicus (Y)
Ottelia alismoides (A,B1,R,W,Y)
Ottelia ulvifolia (W)
Samolus parviflorus (A,B1,J,S1,S2,Y) "Water Cabbage"
Samolus valerandi (An,D,G,R,W) ...

"Mondo Grass" Ophiopogon japonicus - This is a bushy grass with dark green leaves.
"Purple Waffle" Hemigraphis colorata - Dark green broad leaves with purple undersides.

Fountain Plant - Ophiopogon japonicus
Hornwort - Ceratophylum demersum
Japanese Rush - Acorus gramineus
Water Milfoil - Myriophyllum Sp.
Water Primrose - Ludwigia repens
Water Wisteria - Hygrophila difformis ...

mondo grass, fountain plant (Ophiopogon japonicus) -- Grassy, leaves in one plane.
Japanese rush (Acorus gramineus) -- looks like mondo.
Brazil sword, Borneo swords (Spathiphyllum sp.). S. wallisii may be suitable for submersion according to Rataj.

See also: Plants, Dwarf, Aquarium, Chlorophytum, Hemigraphis