Andrea B. Posted May 18, 2013 Share Posted May 18, 2013 Blum, A.G. (2013) Baileya multiradiata Harvey & A. Gray ex A.Gray (Asteraceae) Desert Marigold. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...esert-marigold/ Synonyms: Hierba Amarilla Comment: The silvery-green, woolly foliage and the long leafless stems topped by the cheerful bright yellow daisies make for easy recognition of this native plant which grows abundantly along the roadsides in the desert southwestern US. Its appearance in ultraviolet is uniformly UV-dark but with some patchy, bright iridescence as the light plays across the flower head. Reference: 1. Desert Botanical Garden, Phoenix, Arizona, USA 2. Epple, A.O. (1995) Desert Marigold, page 261. A Field Guide to the Plants of Arizona. Falcon Guides, Globe Pequot Press, Guilford, CT. 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/6.3 for 1/1600" @ ISO 100 with Nikon Coolpix A] Visible Light [f/8 for 1/500" @ ISO 100 in Sunlight with Baader UVIR-Block Filter] Ultraviolet Light [f/4.5 for 1/160" @ ISO 800 with SB-14 UV-modified Flash and Baader UV-Pass Filter] SET 2 Boyce Thompson Arboretum, Superior, Arizona, USA 23 April 2013 Wildflower in botanical garden Equipment: [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor] Visible Light [f/5.6 for 1/800" @ ISO 100 with Nikon Coolpix A] Ultraviolet Light [f/5.6 for 1/60" @ ISO 800 with SB-14 UV-modified Flash and Baader UV-Pass Filter] Link to comment
Andrea B. Posted May 29, 2020 Author Share Posted May 29, 2020 SET 3El Dorado at Santa Fe, Santa Fe County, New Mexico, USA23 May 2020Wildflower I pushed the saturation of the UV flower to find the underlying false colors which are less evident in preceding examples.I messed up the flower name! Should be Baileya multiradiata. Link to comment
colinbm Posted May 30, 2020 Share Posted May 30, 2020 Those colours are strong Andrea.I am wondering what the UV+Blue+Green, would look like with the UV blocked, It seems to me that the UV isn't doing much ?CheersCol Link to comment
Andrea B. Posted May 30, 2020 Author Share Posted May 30, 2020 That’s right, Col. UV is not doing much here because not much UV is being reflected by this flower. So most of the wavelengths passing through the UV+Blue+Green filter are visible reflections. Link to comment
Bill De Jager Posted May 30, 2020 Share Posted May 30, 2020 Nice results, Andrea. It's amazing how uniformly dark the flowers are in UV. We also have this flower in the desert regions of southeastern California. BTW, the scientific name on set 3 should be Baileya multiradiata. I think the specific epithet refers to the unusual abundance of ray flowers in the flower heads in this species. Link to comment
Andrea B. Posted July 21, 2020 Author Share Posted July 21, 2020 I wonder how I screwed that up?? Thank you for catching the name error, Bill. In natural light, the reflectivity along the tips and edges of the rays is more obvious than it is in my indoor, artificially lit photo. I think for flowers the natural sunlight might be the best way to document them. Not always easy when the breezes are blasting away outdoors here in New Mexico. Link to comment
Bill De Jager Posted July 21, 2020 Share Posted July 21, 2020 You're welcome, Andrea. Don't feel bad - it hasn't happened on this site but I've been known to spell my own name Blil, and Denise ended up as Densie. At least that last one I caught before I posted it. Link to comment
bvf Posted July 22, 2020 Share Posted July 22, 2020 Beautiful pictures, Andrea - and well presented. Link to comment
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