Andrea B. Posted December 17, 2012 Share Posted December 17, 2012 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-brushIndian PaintbrushReference:1. Mittelhauser et. al. (2010) Orange Hawkweed, page 92. The Plants of Acadia National Park. The U. of Maine Press, Orono, ME. Set 1Southwest Harbor, Maine, USA13 July 2007Wildflower 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] Ultraviolet Light [f/16 for 6" @ISO400 in Sunlight with Baader UV-Pass Filter] Set 2Southwest Harbor, Maine, USA15 July 2012Wildflower 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] Ultraviolet Light [f/11 for 3" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter] Link to comment
nfoto Posted December 21, 2012 Share Posted December 21, 2012 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. Link to comment
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