Ludwigia hyssopifolia
[Linear Leaf Water Primrose, Water Primrose, Seedbox]

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Close-up views:

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The seeds:

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The seedlings:

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Usually, each flower of Water Primrose has 4 petals. The one with 5 petals shown below should be very rare. It was the only 5-petal flower that I saw on that plant while the rest of the flowers on the same plant have 4 petals.

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