Aponogeton elongatus subsp. elongatus Benth. APNI*
Synonyms: Aponogeton elongatus f. longifolius H.Bruggen APNI*
Description: Tuberous aquatic perennial. rarely or never producing floating leaves.
Submerged leaves to 30 cm long and 4 cm wide; floating leaves with lamina narrow-elliptic, to 15 cm long, 2–4 cm wide, petiole to c. 1 m long, depending on water depth.
Inflorescence spicate, to 15 cm long. Flowers well spaced, yellow. Perianth segments 2, spanthlate, 1.5–2.5 mm long, 0.75–1.5 mm wide. Stamens c. 10, variable in number and apparently not all functional. Carpels 3.
Follicles 5 or 6, 5–6 mm long, with a lateral beak.
Flowering: in warmer months.
Distribution and occurrence: North from the Clarence R. district (NC); also Qld. Commonly grown as an aquarium plant.
Grows in rivers and streams with thick sediment, or floodplain billabongs, tubers can survive many years buried in sediment.
NSW subdivisions: NC
Other Australian states: Qld W.A. N.T.
Differs from subsp. fluitans in rarely or never producing floating leaves. Aponogeton elongatus subsp. fluitans, which is confined to Queensland, commonly produces floating leaves.
Text by Updated by K.L. Gibbons, 19 June 2020.
Taxon concept: Jacobs et al. (2006) Telopea 11(2) 129-134.
|The single subspecies in NSW. Characters and distribution as for the species in NSW.|
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