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Added: 9th May 2013 Description:
I've been shown Poa infirma a couple of times on London Natural History Society walks. It's apparently spreading in London but this is the first time I've come across a possible specimen myself.
Confidence: It might be this. Notes: Small size, these plants c10cm tall(an annual like Poa annua). Pale yellowish general colouration unlike the usual brighter green colour of Poa annua (though Poa annua does sometimes look yellow especially along street edges treated with herbicide). Spikelets short and break apart easily, with very short glume and lemma (measured at c1mm and c2mm on this specimen).
I'm not really expecting any agreements based on these photos, but posted for interest and just in case anyone is able to agree (or can correct me)!
Confidence: I'm as sure as I can be. Notes: I am afraid I cannot agree on this. Like Cabbageleek (comment below), I would call this Poa annua. The general habit and appearance are that of P. annua and, critically, the anthers (the one I can find) match that species. I have taken your first photograph, copied it into Photoshop, blown it up on a large monitor, and there is an anther that is a little out of focus but undoubtedly at least three times as long as wide, and, using the lemmas for scale, much too long for P. infirma. P. annua is very variable and small states often resemble P. infirma - not too surprising as P. annua arose as a hybrid of P. infirma. I suspect that quite a lot of 'infirma' identifications are these small states of P. annua - that do indeed have rather small glumes and lemmas. I think it is important to base identification on the anthers. Sorry.
No interactions present.
Other observations of Annual Meadow-grass ( Poa annua) Species with which
Annual Meadow-grass ( interacts Poa annua)