Utricularia speciosa, known in the New South Wales flora as Brown's Bladderwort, combines mauve flowers with unusually substantial underwater leaves. It is a coastal swamp species whose identity was long obscured within the broader concept of U. dichotoma.
Name and taxonomic history
Utricularia speciosa R.Br. was published in Robert Brown's Prodromus Florae Novae Hollandiae, page 430, in 1810. Kew accepts it as a species native to eastern New South Wales and describes its life form as hydroperennial, an aquatic perennial. Kew taxon record.
Jobson's 2022 overview explains that Brown collected the plant near Sydney in 1804. Bentham later included it under U. dichotoma, a treatment retained by Taylor in 1989. Jobson and Baleeiro reinstated it in 2020 using molecular evidence. The epithet derives from Latin for showy or splendid. New Australian Utricularia taxa.
This series places it in section Pleiochasia, subgenus Polypompholyx. An old identification as U. dichotoma does not make every plant carrying that name U. speciosa; the particular accession requires reassessment. Comparative classification table.
Leaves, flowers and traps
PlantNET describes leaves 30–60 mm long, with broad blades tapering towards their base and rounded or often abruptly squared-off tips. Each has 2–13 veins. Traps measure 1.5–2.5 mm and occur at the flowering-stalk base and stolon nodes. Flowering stalks stand 20–40 cm tall, bearing flowers in opposite pairs or whorls. New South Wales Flora Online.
The mauve corolla measures 11–16 mm. Its upper lip is deeply divided into two lobes; the broad lower lip has three raised yellow ridges at its base. The broad, flattened spur is shorter than the lower lip. Fruit capsules are 4–5 mm long, with seeds about 0.75 mm. Floral and fruit description.
Coastal wetlands and seasonality
The NSW account records four known populations in wallum swamps and lagoons of the central and mid-northern coast, with flowering October–January. This population count reflects the account's knowledge, rather than a claim of a fresh statewide survey. Distribution and flowering record.
Jobson's overview notes plants in deeper swamp water, around 50 cm, and suggests that large multiveined leaves may help the species occupy those habitats. That proposed explanation is an interpretation, not a demonstrated cultivation requirement. Habitat observations.
Conservation evidence
Kew displays a model prediction of non-threatened extinction risk. A prediction should not be substituted for a statutory listing or formal conservation assessment. The restricted distribution described by the regional flora remains relevant context; current legal and Red List status require separate verification. Kew's labelled risk prediction.
Cultivation and propagation
The sources reviewed did not establish a repeatable species-specific cultivation or germination protocol. The reported water depth is an observation from nature, not a prescribed nursery setting.
For legally obtained material, keep provenance and identification photographs, including leaves with visible venation and flower side views. Record vegetative persistence, flowering, fruit development and germination separately. A perennial classification does not establish tolerance of drying, frost or ordinary aquarium conditions.
Research checked 23 September 2026. Cultivation evidence, detailed nomenclatural reconciliation and current conservation assessments remain open checks. Text-only draft; image identity and rights require verification. No Nano Nursery stock availability is implied.
