1. Thought you might like to know that fishermen in the ponds and lakes around Oxford call charophytes [stoneworts] ‘onion weed’.
I always thought the smell was more like stale garlic than onions …
[Natural History Museum, London, April 2008].

2. Stonewort –  gaa-girse – the plant was boiled and given to cattle with liver complaint [Lerwick, Shetland, March 1994].

Image: common stonewort, Chara globularis, Wildlife Garden, The Natural History Museum, Royal Borough of Kensington and Chelsea, London; September 2015.