Sagittaria platyphylla (Engelm.) J.G.Sm.

N. Amer. Sagittaria 55 t.26 (1894) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Naturalised

Emergent leaves linear to narrowly ovate, 10–28 cm long, 2–8 cm wide; apex attenuate; basal lobes usually absent. Inflorescence with 3–8 pseudowhorls of flowers. Bracts 0.4–0.9 cm long. Female flowers with pedicel ascending to spreading, 1–5(–6.5) cm long. Outer perianth lobes reflexed at maturity, 0.3–0.6(–0.8) cm long; inner perianth white (or pink), about twice as long as outer perianth. Filaments of male flowers pubescent. Achene (1.7–)2–2.5 mm long, (0.8–)1.1–1.5 mm wide; surface unadorned or with 1–3 narrow wings; apex with persistent base of style 0.4–1.0 mm long. Flowers Sep.–Jun.

*GipP, *HSF, *MuF, *VRiv. Occurs in drainage and irrigation channels between Nathalia and Yarrawonga where it is a troublesome weed.

Aston (1973) referred the Australian material of this species to Sagittaria graminea var. weatherbiana (Fernald) Bogin. Sainty & Jacobs (1981), and subsequently Jessop (1986), included it under var. platyphylla Engelm. (as subsp. platyphylla). It is not clear whether we have both varieties in Victoria (and hence, Australia) and the distinction between the two has been lost, or that the original variety introduced to Australia has changed and now includes features typical of both varieties. For diagnostic features of the two varieties see Bogin (1955).

Source: Conn, B.J. (1994). Alismataceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons. Inkata Press, Melbourne (as Sagittaria graminea Michx.).
Updated by: Val Stajsic, 2018-08-30
 
References

Adair, R.J.; Keener, B.R.; Kwong, R.M.; Sagliocco, J.L.; Flower, G.E. (2012). The biology of Australian weeds 60. Sagittaria platyphylla (Englemann) J.G. Smith and Sagittaria calycina Englemann, Plant Protection Quarterly 27: 47-58.

Aston, H.I. (1973). Aquatic plants of Australia, Melbourne University Press, Melbourne.

Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Alismatales
family Alismataceae
genus Sagittaria
Higher taxa

Victoria

Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Sagittaria platyphylla in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Sagittaria platyphylla in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Riverina present naturalised
Murray Fans present naturalised
Gippsland Plain present introduced
Highlands-Southern Fall present naturalised

State distribution

Distribution map
State
Western Australia
South Australia
Queensland
New South Wales
Australian Capital Territory
Victoria