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UltravioletPhotography

Flowering out of season?


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The summer is over, here.

We had frost the night between Saturday and Sunday and I did not suspect to find much more interesting flowers this year.

 

To my surprise I found a flower that I only had seen in books before.

I found the plant on a road-bank among other wild flowers and weed, rather far from any garden.

Next to the plant there was a st-John's wort, with it's very last flowers for the year.

 

I think this is a Pilosella aurantiaca even if it is very of season:

post-150-0-68758400-1570439395.png post-150-0-50726500-1570439364.png

The descriptions I find in my Nordic Flora fits very closely, except for the blooming period, that is supposed to be June-July.

 

This kind of fiery orange-red is quite unusual for wild flowers with this shape here in my region.

I like this intense colour very much as it differs so much from all the different yellow species you often see here.

 


Multispectral crops of images below, to show different filtering effects.

All cropped directly from the process-window of FastRawViewer.

No contrast enhancements or sharpening. Only exposure adjustments made to taste.

 

Camera: a full spectrum converted Canon 60D.

Illumination: two quartz-tube converted Godox AD200.

WB against virgin PTFE.

Background: a black toned cotton fabric.

 

UV and UV+ -images with filters stacked to a S8612/2mm:

 

post-150-0-54276500-1570440097.png

U-360/2mm. -- The flower is quite UV-dark.

There is virtually no difference between images from UG2A/2mm, UG1/1mm or U-360/2mm.

 

post-150-0-33335400-1570440165.png

UG5/1mm -- A thin version of the typical "Bee's vision" stack.

It clearly pass some red tones, mixed with the green.

 

post-150-0-87467100-1570440138.png

UG5/1.5mm -- A typical version of the typical "Bee's vision" stack.

It still show some red.

 

post-150-0-06755200-1570440115.png

U-330/2mm -- A thick version of the typical "Bee's vision" stack.

 

post-150-0-96484400-1570440269.png

BG3/2mm -- The typical version of the "Bug's vision" stack.

This stack sometimes turns yellow flower's images red.

Here due to the high UV-darkness, only some dark green remains.

 

post-150-0-03481300-1570440199.png

BG25/2mm -- An alternative version of the "Bug's vision" stack.

This stack can also turn some yellow flower's images red.

Here due to the UV-darkness, only some brighter green remains.

 

NIR-images:

 

post-150-0-71816800-1570440080.png

850nm

 

post-150-0-31591600-1570440066.png

720nm

 

ending with a FullSpectrum image, as a mild contrast to the powerful VIS-image:

post-150-0-56605500-1570443362.png

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It's a Pilosella of the Aurantiaca-complex, indeed. Some microspecies are cultivated, other are indigenous. You might simply call it P. aurantiaca. I'm not to keen on following up all the dubious splitting of these plants into cryptic microspecies. At the end of the day, not even the original authors always recognise their "own" species so assign a new name to them :)

 

Two point worth mentioning. Firstly, it is not unusual for species to have a second flowering. The Asteraceae contains many species or groups that behave in this manner. Secondly, your photos are another item of evidence to document that phyllaries (sometimes called bracts, or falsely associated with sepals) of the flower heads of many composite species are IR dark. Don't ask me *why*. Nature remains on its own. Yet an interesting tidbit of information.

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Thank You very much Birna for the confirmation and added information.

It is always interesting to learn more.

 

All that you say makes sense about naming.

I guessed that it could be a second blooming, but wasn't sure it was possible that they could do that.

 

I found Andrea's entry of this species in the formal section.

It seams quite complete.

But the flower I have found seams more intense in the colours.

 

Is there any value of adding any/some/all of my pictures in a post into the formal section?

If so, are only the VIS and UV images of interest or are the UV+ and NIR-images wanted too?

 

My approach here is mainly that I like pretty and interesting images and like to explore their spectral behaviour in combination with different filters in the UV and UV+ region.

I would not feel sorry if the answer is no.

 

If the answer is yes, it is likely that I need some help to get all format correct.

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Yew, by all means Ulf, do post to the formal botanical section. I or Andrea, if she survives the moving ordeal, will help sort out any formalistic issues should they occur.

 

All spectral impressions have intrinsic value.

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