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Certainly a Phleum but not sure if its Timothy or Smaller cat's-tail. Would be interested if anyone can tell me why this is one but not the other!
Phleum pratense is larger in all parts, but there's too much overlap to make drawing a line easy. (Anything with a panicle over 4 inches long is probably Phleum pratense.) I've seen single clumps - single plants? - with variation in panicle size straddling the divide.
If you were to dissect out a spikelet, Stace says that those of Phleum pratense are over 4mm long, including awns of over 1mm, while those of Phleum bertolonii are less than 4mm long, including awns of less than 1mm, except in exceptional cases.
For a more qualitative character the ligules of Phleum pratense are described as usually obutse, and those of Phleum bertolonii as usually acute.
I have the impression that the panicles of Phleum bertolonii are more tapered at the ends - approaching Alopecurus pratensis in form. (That is that there is a correlation between panicle form and panicle length.)
In Europe there are at least 4 taxa (cytotypes) in the Phleum pratense agg.; while only two are recognised in Britain (diploid bertolonii and hexaploid pratense) I wouldn't be surprised if at least the tetraploid also occurs.
Sorry - what I really meant is, is it possible to make a species ID on the basis of these photos?
Lat/Lng: 52.7968, 1.4758
OS grid ref: TG344278