Brian Laney has been in Huntingdon leading to a chance encounter with Four-leaved Allseed (Polycarpon tetraphyllum), a first record for the county. This is a summer annual of drought stressed habitats. It is native to the south coast, but has been spreading in recent years. The reasons for this are obscure. In part the horticultural trade may be dispersing it, but it may also have been aided by our changing climate. Various drought tolerant species have been expanding their range in VC31 in recent years, Bee Orchid (Ophrys apifera), Pyramidal Orchid (Anacamptis pyramidalis) and Knotted Hedge-parsley (Torilis nodosa) being particularly prominent examples.
He also found Annual Beard-grass (Polypogon monspeliensis), providing a useful range extension. This species is common at Hampton, Peterborough where I took this photo last year.