Common Knapweed ?

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irturner
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Joined: Mon Dec 10, 2018 7:45 pm

Common Knapweed ?

Post by irturner » Tue Jul 09, 2019 8:39 pm

Seems to be a knapweed but not absolutely sure its common as fewer petals and most of the pictures of common knapweed are in profile.
On the banks of a raised pool in a former coal mining site next to what seems to be mostly Southern marsh orchids (probably as I'm going on no spots which is unreliable and all the flower lobes curved rather than a pointed central one which is also unreliable)
Attachments
common knapweed 1.jpg
common knapweed 2.jpg
common knapweed 3.jpg
southern marsh orchid 5.jpg
southern marsh orchid 6.jpg

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Chris Yeates
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Location: Huddersfield, West Yorkshire

Re: Common Knapweed ?

Post by Chris Yeates » Sun Jul 14, 2019 2:15 pm

Hi
The reason that most photographs of Centaurea are shown from the side is that a key character is the shape of the involucral bracts. The flowers are pretty much of a muchness, though of course there are yellow-flowered knapweeds. While we don't have many in this country Flora Europaea lists over 220 Centaurea species. I can just about make out enough of those bracts to say that you have the radiate variant of Centaurea nigra.
You mention a former coal-mining site; these were often seeded with "wildflower" mixes during restoration, and one often sees odd variants of native species in these circumstances.

The orchid looks to me to have some common spotted in there, possibly a cross with southern marsh, or even a back-cross. You don't mention where these photographs were taken - it's always useful to know even a general area. One sees a lot of swarms of Dactylorhiza praetermissa, D. fuchsii and their hybrids in former colliery areas in West Yorkshire - though some of these sites are now getting rather overgrown.

Hope that helps
Chris
"You must know it's right, the spore is on the wind tonight"
Steely Dan - "Rose Darling"

irturner
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Posts: 25
Joined: Mon Dec 10, 2018 7:45 pm

Re: Common Knapweed ?

Post by irturner » Sun Jul 14, 2019 8:58 pm

Thanks the location is Spring Cottage in North West Leicestershire which has been converted into a number of fishing pools with this being beyond this in an area of mixed scrubland towards the quarry workings which seem to be clay (mixture of aggregates quarries and clay quarries in the area as brick works in a number of locations)
A lot of Lucerne around the pools as well.
https://osmaps.ordnancesurvey.co.uk/52. ... 271,17/pin

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