Andrea B. Posted June 13, 2013 Share Posted June 13, 2013 Blum, A.G. (2013) Tetraneuris acaulis (Pursh) Greene (Asteraceae) Angelita Daisy. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...angelita-daisy/ Synonyms:Perky SueStemless Four-nerve DaisyGaillardia acaulis PurshHymenoxys acaulis (Pursh) ParkerComment: The flower stalk has no leaves and so does not qualify as a proper stem, hence the term acaulis. The 3 lobes of the ray are marked with four slightly-darker veins (tetraneuris) most easily seen on the abaxial surface. In UV the disk is UV-dark and the four veins are dark against the UV bright rays. Reference:1. Flora of North America Online (2013) Tetraneuris, vol. 21, pp. 447. FNA. New York & Oxford. http://www.efloras.o...taxon_id=1325992. Flora of North America Online (2013) Tetraneuris acaulis, vol. 21, pp. 451. FNA. New York & Oxford. http://www.efloras.o...taxon_id=1325993. Desert Botanical Garden, Phoenix, Arizona, USA SET 1Desert Botanical Garden, Phoenix, Arizona, USA22 April 2013Wildflower in botanical garden Equipment: [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor] Visible Light [f/16 for 1/60” @ ISO 800 in Sunlight with Baader UVIR-Block Filter] Ultraviolet Light [f/11 for 1/160” @ ISO 800 with SB-14 UV-modified Flash and Baader UV-Pass Filter] SET 2Boyce Thompson Arboretum, Superior, Arizona, USA24 April 2013Wildflower in botanical garden Equipment: [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor] Visible Light [f/8 for 1/2500” @ ISO 400 in Sunlight with Baader UVIR-Block Filter] Ultraviolet Light [f/8 for 1/125” @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter] Link to comment
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