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Aponogeton queenslandicus H.Bruggen
Family Aponogetonaceae
Aponogeton queenslandicus H.Bruggen APNI*

Description: Rooted, submerged and floating, perennial aquatic. Tubers 1–5 cm long, 1.8–2.6 cm wide, extremely strigose.

Leaves submersed and floating; submersed blades uncommon, elliptic to lanceolate, green, 10–13(–70) cm long, 2.9–4.5 cm wide; margins flat; base obtuse, attenuate, or truncate; apex obtuse; 7–9-veined; 0–1 row of lacunae on each side of midvein; petiole to 15 cm long. Floating leaves ovate or elliptic, 2.8–14(–27) cm long, 0.6–4.3 cm wide; light green to green, base mostly cordate, rarely truncate or cuneate; apex obtuse, mucronulate, acuminate, rarely emarginate; 7–9-veined; petiole to 66 cm long. Peduncle to 30(–73) cm long; 1.8–2.5 mm wide at base often only slightly broadening or to 2–4.5 mm wide at base of inflorescence.

Spathe to 1.5 cm long, caducous. Inflorescence yellow, emergent or floating, single, usually tightly-flowered; rachis 15–27(–45) mm wide. Flowers turned in all directions. Perianth segments 2, spathulate, 1-veined, 1.4–2 mm long, 0.5–1 mm wide. Stamens 6, up to 3 mm long, slightly broader at base. Carpels (2–)3(–4). Infructescence dense.

Fruit 2.5–4.5 mm long, 2.3–3 mm wide, with a terminal, often curved beak. Seeds narrowly elliptic, 4–13 per fruit, 1.7–3 mm long, 0.6–1 mm wide, with a double testa; outer testa loose, transparent and reticulate, inner testa brown and close fitting.

Distribution and occurrence: Known from one reserve in NW NSW (FNWP); also in northeast Northern Territory and Queensland south of Cape York Peninsula.

NSW subdivisions: NFWP
Other Australian states: Qld N.T.
Threatened species: NSW BCA: Endangered
AVH map***

Text by S.W.L. Jacobs
Taxon concept: C.B. Hellquist and S.W.L. Jacobs (1998) Telopea 8: 14-15.

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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