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Perennial, rhizomatous aquatic: rosulate, 0.05-0.50 m high. Rhizomes up to 30 mm in diam. Leaves submerged or aerial, 40-430 mm long, lanceolate to linear. Inflorescence of 2 spikes, up to 40 mm long, elongating up to 75 mm in fruit. Flowers arranged laxly in 2 rows on 1 side of spike, scentless; perianth segments 2, petal-like, ovate, white or pink, 1-or 3-veined. Flowering time Sept.-May. Seeds with a single coat, plumule not visible.
Fresh-water aquatic with tuberous rhizome. Tuber globular or obovoid. Leaves 40-430 mm long, needle-like or band-shaped, usually without a blade, often upright and emergent. Flowers: inflorescence with 2 spikes, flowers arranged along one side; perianth segments with 1-7 veins, ± 4 mm long, white or pink; Oct.-Apr. Seeds with 1 coat.
A small plant that keeps growing from year to year. It has a tuberous rhizome. The tubers are 3 cm across. This produces a few grass-like leaves. These are 10-12 cm long. The flower is on a slender stalk with a pair of spikes at the end. These are 1-2 cm long. The flowers are small, crowded, without stalks and white.
Rhizomatous aquatic. Leaves floating, lanceolate to linear. Flowers distichous, white to lilac, with 1-3 tepals, stamens usually 6.
