Andrea B. Posted May 18, 2013 Share Posted May 18, 2013 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, USA10 March 2012Wildflower Synonyms:Minature WoollystarComment: 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] Ultraviolet Light [f/8 for 1/250" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter] Link to comment
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