Perennial stoloniferous herb. Leaves at base roundish, to about 10 cm wide, cordate, margins entire or shallowly scalloped. Flower clusters floating in pairs; summer to autumn. Flowers with calyx to about 1 cm long and yellow petals to about 2 cm long, the margins fringed.

Cultivated plants known as N. geminata (R. Br.) Kuntze, Entire Marshwort, may be N. montana.

 

Other species occasionally grown include:

N. aquatica Hill, Banana Lily, from SE USA, used occasionally in aquaria;

N. crenata (F. Muell.) Kuntze, Wavy Marshwort, available as entirely green forms and as the cultivar 'Variegata' ['Purple Mosaic'];

N. indica (L.) Kuntze, Water Snowflake, from Asia, Africa, America and Australia, grown in warmer areas - there may be several species under this name worldwide, with varying growth habits and tolerances; 

N. spinulosperma Aston, Showy Marshwort, from Qld, NSW and Vic, with large attractive flowers and attractive leaf marbling most noticeable in the cooler months.

Source: Spencer, R. (2002). Menyanthaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 4. Flowering plants. Dicotyledons. Part 3. The identification of garden and cultivated plants. University of New South Wales Press.