Andrea B. Posted July 26, 2014 Share Posted July 26, 2014 Blum, A.G. (2014) Arctium minor Bernhardi (Asteraceae) Common Burdock. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...dock/ Kinfolk Lane, Southwest Harbor, Maine, USA23 July 2014Wildflower Synonyms:Lappa minor HillComment:As Rørslett (2014) has observed in (1), the Burdocks can cause some difficulty in identification due to hybridization. Key ID points for A. minus which are met by this specimen:Raceme-like inflorescence with capitula not clustered at end.Capitula between 2-3cm in width.Burrs have only a few fine hairs.Lower leaf stalks have hollow petioles.Hooked Burdock burrs inspired the invention of VelcroTM. See: http://en.wikipedia.org/wiki/Velcro References:1. Rørslett, B. (2014) Arctium lappa L. (Asteraceae). Greater Burdock. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...reater-burdock/2. New England Wild Flower Society (2014) Arctium minor. Common Burdock. https://gobotany.new.../arctium/minus/ Visible Light [f/5.6 for 1/1000" @ ISO 400 with Nikon V3]An overview of the Burdock plant from which specimen photos were eventually made after it bloomed. Equipment [Nikon D600-broadband + Carl Zeiss 60mm f/4.0 UV-Planar] Visible Light [f/11 for 1/20" @ ISO 400 with onboard Flash and Baader UVIR-Block Filter] Visible Light [extract from preceding photo] Visible Light [f/11 for 2.5" @ ISO 400 with onboard Flash and Baader UVIR-Block Filter]The capitulum is between 2-2.5cm in total width. Ultraviolet Light [f/11 for 15" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]A long exposure was taken so that the UV flash could be fired multiple times for even lighting.Please click the photo for a larger view. Ultraviolet Light [f/11 for 15" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]Please click the photo for a larger view. Link to comment
Andrea B. Posted August 13, 2014 Author Share Posted August 13, 2014 Thanks, Damon.I finally got the remainder of the Burdock photos into the post. Link to comment
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