Andrea B. Posted May 9, 2013 Share Posted May 9, 2013 Blum, A.G. (2013) Physaria acutifolia Rydberg. (Brassicaceae). Double Bladderpod. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...ble-bladderpod/ Durango, Colorado, USA Found on a steep hillside along Roosa Avenue next to which runs the Animas River. 04 May 2013 Wildflower Synonyms: Sharpleaf Twinpod Rydberg's Twinpod Comment: The paired, inflated seedpods (not seen here) give this plant its common name and Physaria ("bladder") designation. The rounded leaves may be sharp-edged, but their most interesting characteristic is the stellate hairs around their leaf pores. I needed more magnification to bring this out, but have provided a small enlarged crop which indicates this hairy starburst. The flower's 4 petals exhibit an upper UV-signature typical of many mustards, but the lower surfaces of the petals are UV-black. Reference: 1. Weber & Wittmann (2012) Physaria A. Gray, page 134. Colorado Flora: Western Slope, 4th Ed. The U. of Colo. Press, Boulder, CO. Equipment [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor] Visible Light [f/11 for 1/1000" @ ISO 400 in Sunlight with Baader UVIR-Block Filter] Ultraviolet Light [f/11 for 1/200" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter] Visible Light [f/11 for 1/1600" @ ISO 400 in Sunlight with Baader UVIR-Block Filter] Detail from preceding showing the radial whorl of hairs around a leaf pit: Link to comment
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