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Around my location, both Centaurium erythaea and C. pulchellum are frequently found. Sometimes I find it really difficult to tell which I am looking at. What do people think are the most reliable features? I've been using presence or absence of basal rosette, then size, colour and shape of petals - not having much success with the flower being stalked or not. I've also always thought that C. pulchellum prefers damper conditions, but at least one book (Streeter) says dry. Stace gives areas where hybrids have been found, which doesn't include East Northamptonshire, but isn't it likely that some might be found here?