Sagittaria platyphylla
(Engelm.) J.G.Sm.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.
VRiv, MuF, GipP, HSF. 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).
Conn, B.J. (1994). Alismataceae. In: Walsh, N.G.; Entwisle, T.J., Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons, pp. 125–129. Inkata Press, Melbourne.
SpinningAdair, 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.
