Preliminary report on a survey of Utricularia (Lentibulariaceae) in the Howard River – Shoal Bay area
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Utricularia leptoplectra F. Muell. Type: Northern Territory, near Port Darwin, M.Holtze 508 (holo: MEL). Distribution: endemic to northern W.A., NT; widespread in the Top End and known from a single collection in W.A. Habitat: wet grasslands, in water to 20 cm deep. Tolerant of deeper flooding and more clayey substrates than most other attached species. Flowering: late wet season and early dry season. Abundance: very common in the Top End. Proposed IUCN category: lc. Utricularia leptorhyncha O.Schwarz Type: near Berry Springs, N.T., Adams 1722 (neo: K). Distribution: endemic to northern W.A. & N.T.; in NT from Litchfield NP to Darwin (at Berry Springs, Howard River floodplain), Bathurst Island to Kakadu. One collection from Mitchell Plateau in W.A. Habitat: Wet sandy seepage areas with Dapsilanthus and grasses, sand lenses on sandstone outcrops, Pandanus woodland with grasses; in water to a few cm deep or on wet sand. Flowering: Feb.-Mar. Abundance: occasional in Darwin Rural area and western Top End. Proposed IUCN category: nt. Utricularia limosa R.B r. Type: Qld, Endeavour River, Banks and Solander s.n. (holo: BM). Distribution: SE Asia and northern parts of tropical Australia (W.A., N.T., Qld); widespread in the Top End. Habitat: wet sedgelands and open grasslands in water to a few cm deep or on damp sand. Tolerant of more stagnant water and more clayey substrates than many other attached species. Flowering: mostly Feb. July. Abundance: common. Proposed IUCN category: lc. Utricularia minutissima Vahl Type: Malay Peninsula, Malacca, Koenig s.n. (holo: C) Distribution: India to Japan and Australia (W.A., N.T., Qld); Litchfield NP to eastern Arnhem Land. Habitat: wet sandy soil in open sedgeland or grassland. Flowering: mostly Feb. Mar. Abundance: relatively common. Proposed IUCN category: lc. Utricularia muellerii Kamienski Type: N.T., Darwin, M.Holtze 474 (lecto: MEL). Distribution: northern parts of tropical Australia and New Guinea; widespread in Top End. Habitat: free-floating aquatic; flooded Melaleuca swamps, lagoons and billabongs. Flowering: Feb. Oct. Abundance: common Proposed IUCN category: lc. Utricularia odorata Pell. Type: Indochina, Cambodia, Kampot, Geoffray 464 (holo: P). Distribution: SE Asia to northern Australia (NT); Darwin area to central Arnhem Land to Katherine area. Habitat: wet sedgelands and grasslands, after water has receeded to ground level.