There are many of these along the drainage line often in similar arrangements that indicate bird droppings; a kind of lily with red berry fruits. The second photo shows fruits and seeds of what I think are the same species. There are sites along the watercourse where fruits are placed evenly spaced as if they were carefully planted.
Some advice from the internet: In general, Italian arum is noted to be difficult to eradicate once it has established in an area. Make sure to wear gloves and clothing to avoid skin contact with Italian arum as plant parts may cause skin irritation, which can be severe for sensitive individuals. Do not move soil with Italian arum to new locations or to compost piles as tubers may be spread and start new infestations.
Manual/Mechanical Control: Carefully digging around the stem, all the way down to the tuber, removing the tuber and daughter tubers, and disposing the tubers in a sealed bag in the garbage, can provide some control after many years. Take care to avoid disturbing neighboring plants, which may be providing some competition for resources, as much as possible. Cutting and bagging the stems with berries will prevent seeds from being spread and beginning new infestations. See also https://www.weedbusters.org.nz/what-are-weeds/weed-list/italian-arum/
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