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UltravioletPhotography

Arctium minus [Common Burdock]


Andrea B.

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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, USA

23 July 2014

Wildflower

 

Synonyms:

  • Lappa minor Hill

Comment:

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.

burdock_071614kinfolkLnSwhME_3062orig.jpg

 

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]

arctiumMinusVisFlash_072314kinfolkLnSwhME_23872pnPfpfResize.jpg

 

Visible Light [extract from preceding photo]

arctiumMinusVisFlash_072314kinfolkLnSwhME_23872pnPfExtract.jpg

 

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.

arctiumMinusHeadMeasure_072514kinfolkLnSwhME_orig01.jpg

 

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.

arctiumMinusUVBaadSB14_072314kinfolkLnSwhME_23921pfResize.jpg

 

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.

arctiumMinorUVBaadSB14_072314kinfolkLnSwhME_23885pn20DetailNoSharp.jpg

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  • 2 weeks later...

Thanks, Damon.

I finally got the remainder of the Burdock photos into the post.

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