Ludwigia longifolia (DC.) H.Hara APNI* 
Description: Glabrous annual to 3 m high; stems 4-angled ± winged.
Leaves alternate, linear to oblong-lanceolate, 10–20 cm long, 5–25 mm wide, reducing in size up the stem.
Flowers solitary in upper leaf axils; bracteoles lanceolate, on ovary base or upper pedicel. Sepals 4 or 5, ovate. Petals 4 or 5, 20–25 mm long, yellow. Stamens 8 or 10.
Fruit oblong to narrow-oblong, 10–35 mm long, 4–8 mm diam., 4-angled, readily dehiscent; seeds in each loculus in several rows, free.
Flowering: Flowers summer–winter.
Distribution and occurrence: Escaped garden plant. Native of Brazil and Argentina.
NSW subdivisions: *NC, *CC, *SC
Text by J. M. Dalby
Taxon concept: Flora of NSW 2 (1991)
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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