Common name: Sagittaria
Sagittaria platyphylla (Engelm.) J.G.Sm. APNI*
Synonyms: Sagittaria graminea var. platyphylla APNI*
Sagittaria graminea subsp. platyphylla Engelm. APNI*
Description: Emergent rhizomatous aquatic perennial; root tubers commonly formed, to 4 cm long and 1.5 cm wide.
Leaves linear or ovate, or rarely cordate, to 25 cm long and 10 cm wide; submerged leaves to 50 cm long with no obvious lamina development.
Male flowers c. 3 cm diam.; sepals 3–8 mm long; petals about twice as long as sepals, mostly white; stamens 12–numerous, filaments dilated and pubescent. Female flowers with numerous carpels, each 1.2–3 mm long; pedicels thickened and recurved in fruit.
Flowering: during warmer months.
Distribution and occurrence: Sporadically naturalised in NSW; also in Qld, Vic, SA, WA. Native of Amer.
Grows in shallow permanent freshwater.
NSW subdivisions: *NC, *CC, *SC, *CWS, *ST, *NWP, *SWP
Other Australian states: *Qld *Vic. *S.A.
Of increasing concern as a weed of rice crops and as an urban weed. Often still cultivated as an ornamental. This has sometimes been misidentified as S. graminea var. weatherbiana in Australia.
Text by S. W. L. Jacobs (1993); edited KL Wilson (Feb 2011)
Taxon concept: Flora of NSW 4 (1993)
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.