Territory:
subsp. odorata (Fragrant water-lily) : Up to the tundra according to Marie-Victorin.
subsp. tuberosa (Tuberous white water-lily) : Southwest Quebec.
Habitat:
subsp. odorata (Fragrant water-lily) : Still water.
subsp. tuberosa (Tuberous white water-lily) : Whitewater of major rivers and of the St-Lawrence.
Flowering:
In bloom in summer.
Similar:
The two species described in Flore Laurentienne are now grouped under the species Nymphaea odorata.
Apart from their different habitats, the Fragrant water-lily has smaller flowers (7-12 cm. Dia.) and smaller leaves, is fragrant, and often has the back of it's leaves red.
The Tuberous white water-lily has larger flowers (10-23 cm. Dia.) and larger leaves, almost no smell and, as its name suggests, has a tuberous rhizome (with tubers).
Another species, rare in Quebec, the Dwarf water-lily, is similar and has the same habitat as the Fragrant water-lily but with much smaller flowers, about the size of a Canadian two dollar (3 cm. Dia.).
The Pygmy water-lily (Nymphaea tetragona) cited in the Flore Laurentienne would not be present in Quebec.