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Eriastrum diffusum [Minature Wool Star]


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#1 Andrea B.

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Posted 18 May 2013 - 06:01

Blum, A.G. (2013) Eriastrum diffusum (A. Gray) H. Mason. (Polemoniaceae). Minature Wool Star. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...ture-wool-star/

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

Synonyms:
  • Minature Woollystar
Comment: The shorter stamens differentiate E. diffusum from E. eremicum which also grows in Arizona. This specimen was found growing in a gravelly wash. The stem of this plant is normally a reddish-brown and the linear leaves green. But in this specimen the leaves appeared to have dried out and browned. The calyx is very wooly. This is more obvious in the UV photograph because the hairs are UV-bright. The yellow and whitish throat of the corolla becomes dark in the UV.

Reference:
1. Epple, A.O. (1995) Minature Wool Star, page 199. A Field Guide to the Plants of Arizona. Falcon Guides, Globe Pequot Press, Guilford, CT.
2.

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

Visible Light [f/8 for 1/1250" @ ISO 400 in Sunlight with Baader UVIR-Block Filter]
Attached Image: eriastrumDiffusumVisSun_031012organPipeNatMonumentAZ_24372proofPnCrop.jpg

Ultraviolet Light [f/8 for 1/250" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]
Attached Image: eriastrumDiffusumUvAndrSun_031012organPipeNatMonumentAZ_24384proofPnCrop.jpg
Andrea G. Blum
Often found hanging out with flowers & bees.