Andrea B. Posted May 29, 2015 Share Posted May 29, 2015 Blum, A.G. (2015) Another Example of Leontodon autumnalis (L.) (Asteraceae) Autumn Hawkbit. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...nother-example/ Causeway Lane, Southwest Harbor, Maine, USA19 July 2014Wildflower Synonyms:Fall DandelionScorzoneroides autumnalis L.Comment: Rørslett (2014) first showed a Norwegian Leontodon autumnalis in ultraviolet(1). Here is another example found in the US which also exhibits the same UV-dark central bullseye.The ridged stem, branching, seeds and small stem bracts help confirm the identification of L. autumnalis. Reference:1. Rørslett, B. (2013) Leontodon autumnalis L. (Asteraceae) Autumn Hawkbit. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...autumn-hawkbit/2. New England Wild Flower Society (2015) Scorzoneroides autumnalis (L.) Moench. Fall-dandelion. https://gobotany.new...des/autumnalis/ Equipment [Nikon D600-broadband + Carl Zeiss 60mm f/4.0 UV-Planar]Unless otherwise noted. Visible Light [f/11 for 1/2" @ ISO-400 with Onboard Flash and Baader UVIR-Block Filter] Visible Light [f/11 for 1/2.5" @ ISO-400 with Onboard Flash and Baader UVIR-Block Filter]The stem has ridges. Visible Light [f/11 for 1/2.5" @ ISO-400 with Onboard Flash and Baader UVIR-Block Filter]There are small bracts on the stem. Visible Light [f/8 for 1/100" @ ISO-400 with Nikon Df and 60/2.8 Micro-Nikkor AFS]Note plumose bristles on the cypselae. Visible Light [f/11 for 1/2.5" @ ISO-400 with Onboard Flash and Baader UVIR-Block Filter]The stems are branched with 2-5 capitula. Ultraviolet Light [f/11 for 15" @ ISO-400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]A long exposure was taken to permit multiple flashes. Ultraviolet Light [f/11 for 15" @ ISO-400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]A long exposure was taken to permit multiple flashes.There is more false blue on the abaxial side of the capitulum. Link to comment
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