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Aponogeton elongatus Benth.
Family Aponogetonaceae
Aponogeton elongatus Benth. APNI*

Description: Tuberous aquatic perennial with mainly submerged leaves and a few 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, obovate, 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.

Fruit thick-coated, 2.5–5.8 mm long, 1.8–5.0 mm wide; beak mostly lateral, occasionally terminal, to 1.5 mm long. Seeds 2–5 per fruit, 1.2–3.2(–42) mm long, 0.5–1.1(–1.6) mm wide, elliptic, with a single testa, closely adhering to embryo or very thin.


Herbarium
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Herbarium
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Flowering: In warmer months.

Distribution and occurrence: North from the Clarence R. district (NC); also Queensland. Commonly grown as an aquarium plant.

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 N.T. W.A. W.A.
AVH map***

Text by S. W. L. Jacobs (1993); edited KL Wilson (Sep 2011)
Taxon concept: Fl NSW vol. 4 (1993); Fl Australia vol. 39 (2011)

N.S.W. occurrences are: subsp. elongatus

APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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