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Clematis cf. 'Lincoln Star' [Clematis]

2 replies to this topic

#1 JMC

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Posted 22 May 2019 - 20:25

Crowther, J. (2019) Clematis L. cf. 'Lincoln Star' (Ranunculaceae) Clematis. Flowers photographed in ultraviolet and visible light.
https://www.ultravio...-star-clematis/

Egham, Surrey, UK
9 to 9:30AM, 23 May 2019
Cultivar in private garden

Comment:
I am not 100% certain that this is 'Lincoln Star', however the appearance is a close match to images found online.

Reference:
(1) Clematis on the Web (accessed June 2019) Lincoln Star

Equipment Visible [Canon EOS 5DSR + 28-105mm EF lens]

Equipment UV [Nikon D610-ACS UV conversion + Asahi 85mm f4.5 Ultra-Achromatic-Takumar with M42-Nikon lensless adapter]

Visible Light [lens set to 90mm, f/10 for 1/200s @ ISO 500 in daylight (partial shade), captured as JPEG in camera with auto whitebalance].
Image resized to 1000 pixels maximum size
Attached Image: 578A9761.JPG

Ultraviolet Light [f/22 for 20s @ ISO 800 in daylight (overcast and in the shade), whitebalanced in Darktable using PTFE disk]
Images resized to 1000 pixels maximum size

Complete flower
Attached Image: DSC_8300 cropped small.jpg

Center of flower (cropped from original image before resizing)
Attached Image: DSC_8300 cropped middle small.jpg

#2 DaveO

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Posted 24 May 2019 - 00:05

G'day,

I see this UV-blue quite a bit in some of my UV images of Australian native flowers so it is quite widespread. You can probably guess where this is going from a retired chemist suffering lab-withdrawal symptoms. It would be nice to see the UV-Vis reflectance spectra of the petals and also of the black stamens etc in the centre.
Here's a very interesting paper which shows such spectra

how to colour a flower
http://rspb.royalsoc...3/1830/20160429

Dave

#3 Andrea B.

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Posted 25 June 2019 - 16:12

Thanks for the contribution, Jonathan.

Dave, I'm enjoying this paper. Good info. Thanks for the link.
Andrea G. Blum
Often found hanging out with flowers & bees.