Brown Galingale, Cyperus fuscus - a Red Data Book weed in a suburban garden

My parent's garden is an untidy, tiny 'un-cultivated' (but not un-cared-for) fragment of suburban Sussex. Yet it harbours some lovely rarities. There are orchids on the lawn - carefully mown around since Barrie spotted their tell-tale leaves amidst the grass. Poisonous Thorn apples are tolerated in the borders. And now he's found a Red Data Book species growing as a weed...

I showed a sedgy thing which grew in a Yoghurt pot of parsley in the greenhouse to a botanist at a Woods Mill meeting, and she has said: "Your plant is Brown Galingale - Cyperus fuscus, which I've never seen before, so am delighted to have met it at last. Apparently now known in the UK as a native only from Surrey, Somerset, Hants and Jersey and RDB Vulnerable. Did you say it was in your garden? - I wonder how it got there?"
Always knew my garden was special. Red Data Book listed. Cor!

It's amazing what turns up and thrives if you let it.