• Ultraviolet Photography

Mentzelia isolata [Isolated Blazingstar]

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#1 Andrea B.

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Posted 29 June 2013 - 05:07

Blum, A.G. (2013) Mentzelia isolata Gentry (Loasaceae) Isolated Blazingstar. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...ed-blazingstar/

Organ Pipe Cactus National Monument, Arizona, USA
10 March 2012

This was a very tough ID to track down. My identification of this flower as M. isolata remains partly circumstantial based on the flower's location and use of various inventory lists(1). Mentzelia are notoriously difficult to sort, so if any reader feels this ID is in error, kindly let me know.
This small yellow flower is UV-reflective against its UV-dark foliage and stems. The streaks and throat of the corolla are UV-dark.

1. Schmidt, Powell & Halvorson (2007) Vascular Plant and Vertebrate Inventory of Organ Pipe Cactus national Monument, page 32. US Geological Survey Southwest Biological Science Center, Tucson, AZ.

Equipment [Nikon D300-broadband + Carl Zeiss 60mm f/4.0 UV-Planar]

Visible Light [f/8 for 1/250" @ ISO 400 in Sunlight with Baader UVIR-Block Filter]
Attached Image: mentzeliaIsolataVisSun_031012organPipeNatMonumentAZ_24500origProofPnCrop.jpg

Ultraviolet Light [f/8 for 1/250" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]
Attached Image: mentzeliaIsolataUVAndrSB14_031012organPipeNatMonumentAZ_24508origProofPnCrop.jpg
Andrea G. Blum
Often found hanging out with flowers & bees.