Vallisneria australis 'Marmor'

Vallisneria australis 'Marmor' is regarded as a selection of the giant vallisneria; its exact origin is unknown.¹² The species is native to south-eastern Australia, where it grows in mostly permanent watercourses and reservoirs.¹ Molecular studies assigned plants traded as 'Marmor' to this species too, but it is doubted that all aquarium forms originate from Australia.¹ One dealer also regards plants supplied as Vallisneria spiralis 'Leopard' as 'Marmor'.²

The leaves, up to approx. 1 m long, bear a pattern of short brown transverse streaks.² Sufficient light brings out reddish-brown tones; when light is lacking, the streaked pattern disappears and the leaves tend to stay green.¹² It manages without added CO₂ but grows better with it; medium light is sufficient, and a nutrient-rich substrate is beneficial.² Via runners it forms dense stands, which belong in the background of large aquariums at least 50 cm tall.²