Primrose willow(Ludwigia longifolia) is a small upright shrub usually growing 0.5-2 m tall. Its hairless stems are conspicuously square in cross-section and usually also somewhat winged. Its bright yellow flowers have four greenish or reddish sepals and four, or rarely five, bright yellow petals.
Learn more at: https://weeds.brisbane.qld.gov.au/weeds/primrose-willow
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