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UltravioletPhotography

Pilosella aurantiaca [Orange Hawkweed]


Andrea B.

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Blum, A.G. (2012) Pilosella aurantiaca (L.) F.W.Schultz & Schultz-Bip. (Asteraceae) Orange Hawkweed. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...range-hawkweed/

 

Synonyms:

  • Hieracium aurantiacum L.
  • Devil's Paint-brush
  • Indian Paintbrush

Reference:

1. 
Mittelhauser et. al. (2010) Orange Hawkweed, page 92. The Plants of Acadia National Park. The U. of Maine Press, Orono, ME.

 

Set 1

Southwest Harbor, Maine, USA

13 July 2007

Wildflower

 

Comment:

This Orange Hawkweed was found growing in a grassy lot along High Street in Southwest Harbor. Summer wildflowers are left unmown in empty lots and along the edges of yards in many Maine towns. The flower is UV-dark, but not uniformly so, having a slightly patchy look in one specimen below and showing more of a bullseye appearance in another specimen.

 

Equipment [Nikon D200-broadband + Nikon 105mm f/4.5 UV-Nikkor]

 

Visible Light [f/16 for 1/250" @ISO400 in Sunlight with Baader UV/IR-Blocking Filter]

hieraciumAurantiacumVis071007swhME_15806proofPnCrop.jpg

 

Ultraviolet Light [f/16 for 6" @ISO400 in Sunlight with Baader UV-Pass Filter]

hieraciumAurantiacumUV071007swhME_15813proofPnCrop.jpg

 

Set 2

Southwest Harbor, Maine, USA

15 July 2012

Wildflower

 

Comment: This specimen was found growing in the gravel path beside the summer cottage on Somes Sound. Others were found along the weedy, grassy borders of Kinfolk Lane.

 

Equipment [Nikon D300-broadband + Carl Zeiss 60mm f/4.0 UV-Planar]

 

Visible Light [f/16 for 1/2" @ ISO 200 with onboard Flash and Baader UV/IR-Blocking Filter]

hieraciumAurantiacumVisFlash_071512swhME_28087proofPnCrop.jpg

 

Ultraviolet Light [f/11 for 3" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]

hieraciumAurantiacumUVBaadSB14_071512swhME_28113proofPnCrop.jpg

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These orange or red-flowered hawkweeds now often are treated in a separate genus, Pilosella. In terms of UV reflectivity of the flower heads, the Pilosella group clearly differs from Hieracium s.str. as the latter typically have very UV-reflective ligules and prominent central bull's-eye pattern to the flower heads.
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