Andrea B. Posted December 19, 2012 Share Posted December 19, 2012 Blum, A. G. 2012. Mentzelia albicaulis (Hook.) Torrey & A.Gray. (Loasaceae). Small-flowered Blazingstar. Flowers photographed in visible, ultraviolet and infrared light. http://www.ultraviol...g-star Mohave National Preserve, San Bernardino County, California, USAalong Kelbaker Road03 March 2012Wildflower Comment:M. albicaulis and M. obscura can only be differentiated by examining the seeds. The preponderance of observations in Jepson eFlora for this specimen's location is M. albicaulis. Thus the identification here is circumstantial. Note that the flower petals are not completely unfurled, and so the characteristic rounded silhouette is not yet apparent.In UV the corolla has a UV-black central bullseye and UV-dark stamens and carpel. The pollen is UV-black. Reference:1. Cal Photos. (2012) Mentzelia albicaulis. Biodiversity Sciences Tech. Group, U. of Cal.-Berkeley, Berkeley, CA. http://calphotos.ber...lia+albicaulis2. Jepson eFlora. (2012). Mentzelia albicaulis (Hook.) Torr. & A. Gray. Jepson Herbarium, U. of Cal.-Berkeley, Berkeley, CA.http://ucjeps.berkel...M.pl?tid=332213. Morhardt, S. & Morhardt, E. (2004) Mentzelia albicaulis, page 191. California Desert Flowers. U. of Cal. Press, Berkeley, CA. Equipment [Nikon D300-broadband + Carl Zeiss 60mm f4.0 UV-Planar] Visible Light [f/11 for 1/400" @ ISO 200 in Sunlight with Baader UVIR-Block Filter] Ultraviolet Light [f/11 for 1/250" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter] Infrared Light [f/11 for 1/1000" @ ISO 400 in Sunlight with B+W-092 IR-Pass Filter] Link to comment
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