• Ultraviolet Photography

Eriogonum thomasii [Thomas' Buckwheat]

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#1 Andrea B.

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Posted 02 July 2013 - 01:19

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

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.

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.
Attached Image: eriogonumThomasiiVIsSun03052012joshuaTreeNpCA_35306orig.jpg

Visible Light [f/11 for 1/250" @ ISO 400 with onboard Flash and Baader UVIR-Block Filter]
Attached Image: eriogonumThomasiiVIsSun03052012joshuaTreeNpCA_23365origProofPn.jpg

Ultraviolet Light [f/8 for 1/250" @ ISO 635 with SB-14 UV-modified Flash and Baader UV-Pass Filter]
Attached Image: eriogonumThomasiiUVBaadSB1403052012joshuaTreeNpCA_23377origProofPn.jpg
Andrea G. Blum
Often found hanging out with flowers & bees.