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UltravioletPhotography

Eriogonum thomasii [Thomas' Buckwheat]


Andrea B.

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Blum, A.G. (2013) Eriogonum thomasii Torrey (Polygonaceae) Thomas' Buckwheat. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...omas-buckwheat/

 

Joshua Tree National Park, California, USA

Lat [N33°43'07.2"] Lon [W115°48'36.9"] Alt[789]

05 March 2012

Wildflower

 

Comment:

Having an airy branched structure and small yellow flowers, E. thomasii is a year-round blomming member of the Creosote Bush or Joshua Tree community in the Mohave and Sonoran deserts of the southwestern US and northwestern Mexico.

In UV the E. thomasii flower appears moderately UV-reflective with some darker center marks. The corolla seems to show some iridescence, but given the small size of the flower, a closer study is needed to confirm this and other UV characteristics.

 

Reference:

1. Jepson eFlora (2013) Eriogonum thomasii. Jepson Herbarium, U. of Cal.-Berkeley, Berkeley, CA. http://ucjeps.berkel...JM.pl?tid=24949

 

Equipment [Nikon D300-broadband + Nikon 105mm f/4.5 UV-Nikkor]

 

Visible Light [f/3.2 for 1/2000" @ ISO 400 with Nikon D3S + Nikon 60mm f/2.8G Micro-Nikkor]

Delicate, yet tough.

eriogonumThomasiiVIsSun03052012joshuaTreeNpCA_35306orig.jpg

 

Visible Light [f/11 for 1/250" @ ISO 400 with onboard Flash and Baader UVIR-Block Filter]

eriogonumThomasiiVIsSun03052012joshuaTreeNpCA_23365origProofPn.jpg

 

Ultraviolet Light [f/8 for 1/250" @ ISO 635 with SB-14 UV-modified Flash and Baader UV-Pass Filter]

eriogonumThomasiiUVBaadSB1403052012joshuaTreeNpCA_23377origProofPn.jpg

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