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|  » Stats |
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| | Welcome to our newest member, Rudie | |  | 
11-08-2008, 03:49 PM
|  | Commander of the Wild Empire | | Join Date: Mar 2008
Posts: 3,089
| | | flower id
is this common water-crowfoot?  
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Leif |
11-08-2008, 04:41 PM
| | Active Member | | Join Date: Nov 2007
Posts: 42
| | | Re: flower id
It’s certainly a water-crowfoot. I couldn’t say which one, though – they’re a bit of a pig to identify.
The leaves you show look like one of the watercress species. Most likely Rorippa nasturtium-aquaticum (the commonest one), though there’s also Rorippa microphylla (Narrow-fruited Water-cress) and a hybrid of the two. |
11-08-2008, 06:30 PM
|  | Officer of the Wild Empire | | Join Date: Feb 2007
Posts: 549
| | | Re: flower id
And if I have got the scale right, Britain's smallest flowering plant, Wolffia arrhiza.
All the best
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John
http://www.orchidsofbritainandeurope.co.uk/ |
11-08-2008, 06:58 PM
| | Commander of the Wild Empire | | Join Date: Jan 2006 Location: London
Posts: 3,607
| | | Re: flower id
Quote:
Originally Posted by ceterach  And if I have got the scale right, Britain's smallest flowering plant, Wolffia arrhiza.
All the best | No, wrong shape - looks like Lemna minuta |
11-08-2008, 08:21 PM
| | Officer of the Wild Empire | | Join Date: Feb 2007
Posts: 549
| | | Re: flower id
Quote:
Originally Posted by Tiggrx No, wrong shape - looks like Lemna minuta | Why did I know you were going to say that!  If the "other" Lemna species present is L.minor is not the smaller plant too small for L.minuta and they appear to be in pairs.
Leifus, you have to go back and rub some between your fingers and report back!
All the best
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John
http://www.orchidsofbritainandeurope.co.uk/ |
11-08-2008, 08:28 PM
| | Commander of the Wild Empire | | Join Date: Mar 2008
Posts: 3,089
| | | Re: flower id
Why rub between my fingers?
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Leif |
11-08-2008, 08:29 PM
| | Officer of the Wild Empire | | Join Date: Feb 2007
Posts: 549
| | | Re: flower id
If it feels gritty then it is Wolffia. I think I remember that correctly.
Sorry couldn't resist the tease!!
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John
http://www.orchidsofbritainandeurope.co.uk/ |
11-08-2008, 08:38 PM
| | Commander of the Wild Empire | | Join Date: Mar 2008
Posts: 3,089
| | | Re: flower id
thats ok. anyway anyone for the water crowfoot? i did find some river water crowfoot today as well nearby
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Leif |
12-08-2008, 05:23 AM
| | Commander of the Wild Empire | | Join Date: Jan 2006 Location: London
Posts: 3,607
| | | Re: flower id
Quote:
Originally Posted by ceterach Why did I know you were going to say that! If the "other" Lemna species present is L.minor is not the smaller plant too small for L.minuta and they appear to be in pairs. | I think it is about the right size for L. minuta and too big for Wolffia. Try comparing with this picture that shows Spirodela polyrhiza (biggest), Lemna minor (medium) & Wolffia arrhiza (smallest). 
As to the Water-crowfoot - you are very unlikely to be able to get it identified from a photo - there are several very similar species and they differ in rather minor characters. The shape of the nectary is often important.
Last edited by Tiggrx; 12-08-2008 at 05:35 AM.
Reason: forgot to add picture - as always ;-)
|
12-08-2008, 08:36 AM
| | Commander of the Wild Empire | | Join Date: Mar 2008
Posts: 3,089
| | | Re: flower id
thanks anyway
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Leif | | |
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