Andrea B. Posted December 12, 2013 Share Posted December 12, 2013 Blum, A.G. (2013) Mertensia brevistyla S. Watson (Boraginaceae) Shortstyle Bluebells. Flowers photographed in visible and ultraviolet light. http://www.ultravioletphotography.com/content/index.php?/topic/626-mertensia-brevistyla-shortstyle-bluebells/ Comment:The key step in identifying M. brevistyla is the perpendicular orientation of the adaxial trichomes towards the central leaf vein. (See Set 2 below.) This specimen was found growing at about 2250 meters.In UV the cluster of bluebells seems primarily remarkable for the UV-bright hairs on the sepals. The corollas are moderately UV reflective with no marked pollination guides. Reference:1. Weber & Wittmann (2012) Mertensia Roth, page 114. Colorado Flora: Western Slope, 4th Ed. The U. of Colo. Press, Boulder, CO. SET 1Twin Pines, La Plata County, Colorado, USA28 April 2013Wildflower Equipment: [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor] Visible Light [f/7.1 for 1/800" @ ISO 200 with Nikon Coolpix A]A single M. brevistyla in situ with the bluebell cluster just developing. Visible Light [f/8 for 1/3” @ ISO 400 in Sunlight with Baader UVIR-Block Filter] Ultraviolet Light [f/8 for 1/2” @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter] Ultraviolet Light [f/11 for 1/60” @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter] SET 2Mesa Verde National Park, Montezuma County, Colorado, USA02 May 2013Wildflower Visible Light [f/6.3 for 1/1000" @ ISO 200 with Nikon Coolpix A]Note the orientation of the hairs on the upper surface of the leaf. Link to comment
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