Plants of South Eastern New South Wales
Ludwigia longifolia
Common name
Long-leaf willow primrose
Family
Onagraceae
Where found
Moist sites and in water. Sydney area to the eastern edge of the Blue Mountains and north to Gosford.
Notes
Introduced erect shrub or perennial or annual herb to 3 m high. Branches that are detached during floods can take root and develop into new plants. Woody stems with reddish brown bark. Stems 4-angled, usually somewhat winged, becoming rounded and somewhat woody with age, hairless, often red, usually much branched. Leaves alternating up the stems, 1–35 cm long, 4–25 mm wide, somewhat glossy to glossy, hairless or almost hairless. Flowers with 4-5 yellow petals, each 20–25 mm long, falling early, and 4-5 greenish or reddish sepals, which remain on the seed cases at the seeding stage. Flowers single. Flowers mostly summer–winter. Seed cases sharply 4-angled, hairless, 10-42 mm long, 4-8 mm wide.
General Biosecurity Duty all NSW. General Biosecurity Duty with additional restrictions in the Central Tablelands and South East areas, NSW
PlantNET description: http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Ludwigia~longifolia (accessed 24 January, 2021)
This identification key and fact sheets are available as a free mobile application:
