And here is the plant - with New Zealand Willowherb growing in the wetter banks of the road ditch. I shall have to use Poland and Clement...
Or maybe it is Chamomile Lawn??
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Keying out with Poland led me to the possibility of Cotula.
It was a plant with alternate simple leaves and deeply pinatifid, very slightly fleshy leaves, no hairs; It had buds that showed it was the daisy family, It came out in Section PU in Poland. Cotula coronopifolia is the only daisy type plant in that section. I had a look on the internet at Cotula and "invasive species". (C coronopifolia has yellow petals and is prostrate and grows in salty places, so it wasn't likely to be that species itself)
Keying with Stace, and internet picture searches, and dissection of the flower bud (Asteraceae) which had continued to grow in the plastic bag I had left it in, led me to Cotula australis - Batchelors buttons.
Hmm, no Cotula australis in this part of Yorkshire - surely this area has already been well surveyed.
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3. Digression
Note on Pirri Pirri burr. Pirri Pirri burr has ball-like heads of hooked seeds (burs). It spreads on peoples shoes and animals. The two other places I have seen it are on Lindisfarne where it is a big problem and on Skipwith Common - both are nature reserves. But it has stipules. My plant does not.
You can buy Pirri pirri burr in shops. Plantlife consider that it should be a "Schedule 9" plant - Certain species of plants and animals that do not naturally occur in Great Britain have become established in the wild and represent a threat to the natural fauna and flora. They are put on schedule 9.
4. Further investigation
I was due to take Nidderdale AONB Botany group out to visit that road on Wed 14 June (the next day) .
I emailed The local BSBI recorder, and I emailed Kevin Walker of the BSBI, who I knew would know the area I had visited.
He replied! Thanks.
Yes it is Cotula.. (but not Cotula australis) - It's not in our books! It is Cotula alpina. This plant was reported to him by Linda Robinson in 2009 .., and possibly first noted (though misidentified in c1978) in Nidderdale.. but there is more story to come.. .. that will be on another post
This was his first message to me: -
"It is Cotula alpina from Australia. Linda Robinson first alerted us to it but I've traced records back to 1978 by Harrogate Naturalists. It is widespread on grouse moor tracks on east side of Nidderdale, North York moors and north of Ullapool. In all these areas it is spreading along tracks/road verges. It is a very rare rockery plant but we're not sure how it got from gardens to grouse moors!"
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I have now read Linda Robinson's article on discovering it in 2009.
http://archive.bsbi.org.uk/BSBINews113.pdf
So - we were eight years late in discovering it.. I wonder how much it has spread since then - the verges on either side of the road are almost entirely this Cotula
Meanwhile, shortly to come are pictures of our day on 14 June:
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