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UltravioletPhotography

Tetraneuris acaulis [Angelita Daisy]


Andrea B.

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Blum, A.G. (2013) Tetraneuris acaulis (Pursh) Greene (Asteraceae) Angelita Daisy. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...angelita-daisy/

 

Synonyms:

  • Perky Sue
  • Stemless Four-nerve Daisy
  • Gaillardia acaulis Pursh
  • Hymenoxys acaulis (Pursh) Parker

Comment:

The flower stalk has no leaves and so does not qualify as a proper stem, hence the term acaulis. The 3 lobes of the ray are marked with four slightly-darker veins (tetraneuris) most easily seen on the abaxial surface. In UV the disk is UV-dark and the four veins are dark against the UV bright rays.

 

Reference:

1. Flora of North America Online (2013) Tetraneuris, vol. 21, pp. 447. FNA. New York & Oxford. http://www.efloras.o...taxon_id=132599

2. Flora of North America Online (2013) Tetraneuris acaulis, vol. 21, pp. 451. FNA. New York & Oxford. http://www.efloras.o...taxon_id=132599

3. Desert Botanical Garden, Phoenix, Arizona, USA

tetraneurisAcaulisSign_042213desBotGardenPhoenixAZ_283origProofPn.jpg

 

SET 1

Desert Botanical Garden, Phoenix, Arizona, USA

22 April 2013

Wildflower in botanical garden

 

Equipment: [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor]

 

Visible Light [f/16 for 1/60” @ ISO 800 in Sunlight with Baader UVIR-Block Filter]

tetraneurisAcaulisVisSun_042213desBotGardPhoenixAZ_7521proofPnCrop.jpg

 

Ultraviolet Light [f/11 for 1/160” @ ISO 800 with SB-14 UV-modified Flash and Baader UV-Pass Filter]

tetraneurisAcaulisUVBaadSB14_042213desBotGardPhoenixAZ_7536proofPnCrop.jpg

 

SET 2

Boyce Thompson Arboretum, Superior, Arizona, USA

24 April 2013

Wildflower in botanical garden

 

Equipment: [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor]

 

Visible Light [f/8 for 1/2500” @ ISO 400 in Sunlight with Baader UVIR-Block Filter]

tetraneurisAcaulisVisSun_042413boyceThomArbSupAZ_9255origProofPn.jpg

 

Ultraviolet Light [f/8 for 1/125” @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]

tetraneurisAcaulisUVBaadSB14_042413boyceThomArbSupAZ_9222origProofPn.jpg

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