Perennial aquatic herbs exserted to c. 0.6 m above water level. Stems few-branched, decumbent, producing numerous adventitious roots from each lower node. Leaves linear-acuminate, c. 80 x 12 mm, basal cylindrical sheath c. 12 mm long; upper younger leaves progressively smaller, glabrous. Inflorescences terminal, glandular-pubescent, compact, c. 20-40 mm long, consisting of several to many one-sided, dense, short cymes and reduced thyrses, with flowers close together, ebracteolate, shortly pedicelled. Flowers small, zygomorphic, open in morning for short period. Sepals ovate, 2-3 mm long, pale purple, glandular-pubescent. Petals 3, mauve, unequal, upper 2 ovate, c. 3-4 mm long, lower linear. Stamens 6; 3 lower longer, declinate, anthers with narrow connectives; 3 upper somewhat shorter, anther sacs round, separated by a broad, square, yellow connective. Ovary compressed-cordate; style long, filiform; stigma terminal, minute, included within shrivelled petals after anthesis. Capsule c. 2 mm long, pale, shiny; seed hemi-ovoid, 1-1.5 mm long, smooth, greyish blue.
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Perennial herb, heliophyte, 0.25-0.60 m high; stems few branched, decumbent. Leaves sessile, 80 x 12 mm, glabrous. Inflorescence terminal, glandular-pubescent, compact, consisting of several 1-sided, dense, short cymes and reduced thyrses, ebracteolate, shortly pedicelled. Flowers zygomorphic, pale blue, glandular-pubescent; petals 3, mauve, unequal, upper 2 ovate, lower linear. Stamens 6, 3 lower longer, declinate; anthers with narrow connectives; sacs separated by broader, yellow connective. Ovary compressed-cordate; style filiform; stigma terminal, minute. Flowering time July, Feb.?.
Sprawling plants 0.3-1.0 m high. Perennial herb, aquatic, exserted up to ± 0.6 m above water level. Leaves cauline. Inflorescences glandular-pubescent, usually dense. Flowers purple to mauve.
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