nfoto Posted July 2, 2014 Share Posted July 2, 2014 Rørslett, B. 2014. Alcea rosea L. (Malvaceae). Hollyhock. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...osea-hollyhock/ Alcea rosea L.Syn. Althaea rosea (L.) Cav. NO: StokkroseSE: StockrosDE: StockroseEN: Hollyhock A tall perennial species, native to Europe and widely cultivated for its large showy flowers. The wild forms have pinkish flowers whilst the cultivated ones range from white to deep purple. A. rosea prefers dry habitats and thrives well in coastal regions. Plants photographed outside Copenhagen, Denmark 28 June 2014. Image reference: ALCA_ROS_B1406281434_VIS.jpgVisible light: Nikon Df, Voigtländer APO-Lanthar 125 mm f/2.5 lens, daylight. Image reference: ALCA_ROS_I1406281825_UV.jpgUltraviolet light: Nikon D3200 (modified), Coastal Optics 60 mm f/4 APO lens, internal Baader U2" (Venus) filter, SB-140 flash. The presence of conical cells makes the corolla shiny under UV illumination. The pollen is rendered UV-dark. The basal nectaria are UV-bright. [Published 2 July 2014] Link to comment
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