Question: This is a weed -- several of them sprouted uninvited out of some loam I had spread. The loam was …
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Question
This is a weed -- several of them sprouted uninvited out of some loam I had spread. The loam was full of seeds of various Polygonaceae and grasses. It came from Lexington, Massachusetts and I assume the seeds are from the Boston area.
Answer
Dear jfc, you appear to have photographed Persicaria longiseta (Oriental lady's-thumb smartweed). This is a non-native species that can be quite invasive under the right conditions. The long cilia at the apex of the stipules and bracteoles are good identifying characteristics.
