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UltravioletPhotography

Linum grandiflorum [Red Flax]


Andrea B.

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Blum, A.G. (2014) Linum grandiflorum Desfontaines (Linaceae) Red Flax. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...lorum-red-flax/

 

Synonyms:

  • Scarlet Flax

Comment:

An introduction to the US, L. grandiflorum has become naturalized in some areas.

In UV the flower has a central UV-dark star inside a somewhat lighter central circular area. A diffuse version of this pattern is seen also in the Visible flower.

 

Reference:

1. Jepson eFlora (2014) L. grandiflorum Desf. Jepson Herbarium, U. of Cal.-Berkeley, Berkeley, CA. http://ucjeps.berkel...?4965,4980,4982

 

Equipment [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor]

 

Set 1

Boyce Thompson Arboretum, Superior, Arizona, USA

24 April 2013

Wildflower in botanical garden

 

Visible Light [f/8 for 1/1600" @ ISO 400 in Sunlight with Baader UVIR-Block Filter]

linumGrandiflorumVisSun_042413boyceThompsonArbSuperiorAZ_9069pnPfRes.jpg

 

Ultraviolet Light [f/8 for 1/200" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]

linumGrandiflorumUVBaadSB14_042413boyceThompsonArbSuperiorAZ_9097pnPfRes.jpg

 

Set 2

Desert Botanical Garden, Phoenix, Arizona, USA

25 April 2013

Wildflower in botanical garden

 

Visible Light [f/11 for 1/200" @ ISO 100 with onboard Flash and Baader UVIR-Block Filter]

linumGrandiflorumVisFlash_042513desBotGardPhoenixAZ_9620pnCrop2Res.jpg

 

Ultraviolet Light [f/11 for 1/100" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]

linumGrandiflorumUVBaadSB14_042513desBotGardPhoenixAZ_9636pnPfRes.jpg

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Hmmm.

 

After looking through some of your photos of flowers that are predominantly red in color (including from some of my own tests of red-dominant colored flowers) ... I am finding that the majority of them seem to turn white under UV reflected photography (particularly all of those with some type of observed centralized UV-dark scheme). This also includes flowers with petals that have hints of pink ("rose" red) but are still predominantly red.

 

Not to say that all red-dominant flowers with UV-dark "bull's eye" centers do this ... but it seems like it is quite a common result (if they exhibit any UV brightness at all, that is). Is this hunch true, or is my UV sampling experience still limited?

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Limited experience might be the answer.

 

Plenty of red-flowered species say from Caryophyllaceae, Geraniaceae, Rosaceae, and Asteraceae appear UV-dark whether or not they have central patterns in visible light.

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