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UltravioletPhotography

Leontodon autumnalis [Autumn Hawkbit]: Another Example


Andrea B.

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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, USA

19 July 2014

Wildflower

 

Synonyms:

  • Fall Dandelion
  • Scorzoneroides 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]

scorzoneroidesAutumnalis071914causewayLnSwhME_23283pnPf.jpg

 

Visible Light [f/11 for 1/2.5" @ ISO-400 with Onboard Flash and Baader UVIR-Block Filter]

The stem has ridges.

scorzoneroidesAutumnalis071914causewayLnSwhME_23327origpn.jpg

 

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.

scorzoneroidesAutumnalis071914causewayLnSwhME_23325origpn.jpg

 

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.

scorzoneroidesAutumnalisSeeds_071914causewayLnSwhME_6911origpn.jpg

 

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.

scorzoneroidesAutumnalis071914causewayLnSwhME_23333pnPf.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 to permit multiple flashes.

scorzoneroidesAutumnalis071914causewayLnSwhME_23291pf.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 to permit multiple flashes.

There is more false blue on the abaxial side of the capitulum.

scorzoneroidesAutumnalis071914causewayLnSwhME_23316pf.jpg

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