Andrea B. Posted January 25, 2021 Share Posted January 25, 2021 Blum, A.G. (2021) Dieteria canescens (Pursh) Nuttall (Asteraceae) Hoary Tansy Aster. Flowers photographed in ultraviolet, infrared and visible light. https://www.ultravio...ry-tansy-aster/ Updated 20 Jan 2022 Added Set 3. Synonyms: Machaeranthera canescens (Pursh) A.Gray This is the primary synonym for D. canescens. It is still in use in some floras and field guides. There are about 50 other synonyms which I will not list here in the interests of saving space. Other Common Names: Gray Tansy Aster Hoary Aster Purple Tansyaster Sand Daisy Comment: For the amateur botanist (such as me!), Dieteria canescens is one of those difficult-to-identify flowers because it is almost a twin to either Dieteria bigelovii or Dieteria asteroides. The differences are subtle and hybrids and intergrades make the task harder. The best summary of the differences between D. canescens and D. asteroides is given by Al Schneider on his Dieteria page(4) where he references Flora of North America(3), Allred's Flora Neomexicana III(1), Weber's Colorado Flora(6) and the Flora of the Four Corners Region(7), amongst others. My local Dieteria have the following characteristics which lead me to a D. canescens identification. phyllaries with glandular hairs mostly on the tips peduncles are hairy but have no glandular hairs leaves are hairy but have no glandular hairs midstem leaves are linear-ish, about 2.0 mm wide stem leaves are not clasping or auriculate juniper-piñon shrub habitat between 6600-7000 feet Dieteria canescens has a UV-dark appearance in reflected UV light which is typical of many asters I have photographed. There are some bright areas around the central disk and from the pollen-laden anther tips. References: 1. Allred, Kelly W., Ivey, Robert DeWitt (2012) Flora Neomexicana III: An Illustrated Identification Manual. Dieteria Key, page 127. Print on demand at lulu.com. 2. Finley, Willa F., Nieland, Lashara J. (2013) Land of Enchantment Wildflowers. Dieteria canescens, page 180. Texas Tech University Press, Lubbock, Texas. 3. Flora of North America Online (acc 27 Jan 2021) Dieteria canescens, Vol. 20, Page 398. FNA, New York & Oxford. 4. Southwest Colorado Wildflowers (acc 25 Jan 2021) Dieteria. Website published and maintained by Al Schneider and hosted by Rocky Mountain Biological Laboratory, Gothic, Colorado. 5. SEINet Arizona-New Mexico Chapter (acc 27 Jan 2021) Dieteria canescens. 6. Weber & Wittmann (2012) Colorado Flora: Western Slope, 4th Ed. Machaeranthera Key, page 94. The University of Colorado Press, Boulder, Colorado. 7. Google Books (acc 30 Jan 2021) Flora of the Four Corners Region by Kenneth D. Heil. SET 1 La Tienda, Eldorado at Santa Fe, New Mexico, USA 03 June 2020 Wildflower Equipment [Nikon D610-broadband + Nikon 105mm f/4.5 UV-Nikkor] Visible Light [f/11 for 1/320" @ ISO-100 in Sunlight with Baader UVIR-Block Filter] Visible Light [f/16 for 1/10" @ ISO-200 with Onboard Flash and Baader UVIR-Block Filter] Hairy stem and leaves have no glandular hairs. Visible Light [f/11 for 1/8" @ ISO-200 with Onboard Flash and Baader UVIR-Block Filter] Ultraviolet Light [f/8 for 1/4" @ ISO-400 with SB-14 UV-modified Flash and BaaderU UV-Pass Filter] Infrared Light [f/16 for 1/3" @ ISO-200 with Onboard Flash and B+W 092 IR-Pass Filter] UV+Blue+Green [f/8 for 13" @ ISO-200 in Ambient Light/Sunlight with U-330(2.0mm) + S8612(2.0mm)] SET 2 Bosque Ave and Eldorado Ave, Eldorado at Santa Fe, New Mexico, USA 23 May 2020 Wildflower Comment: This D. canescens was of interest because of its pink color. Equipment [Nikon D610-broadband + Nikon 105mm f/4.5 UV-Nikkor] Visible Light [f/11 for 1/1000" @ ISO-400 in Sunlight with Baader UVIR-Block Filter] Visible Light [f/16 for 1/200" @ ISO-200 in Sunlight with Baader UVIR-Block Filter] Ultraviolet Light [f/11 for 1/60" @ ISO-400 in Sunlight with one SB-14 UV-modified Flash and BaaderU UV-Pass Filter] UV+Blue+Green [f/8 for 1/25" @ ISO-1250 in Sunlight with U-330(2.0mm) + S8612(2.0mm)] This photo was rendered in its raw colors with no application of white balance. The filter passes UV, some blue and a little bit of green. SET 3 Los Compadres, Eldorado at Santa Fe, New Mexico, USA 09 October 2021 Wildflower Equipment [Panasonic S1R-broadband + Nikon 105mm f/4.5 UV-Nikkor] Visible Light [f/11 for 1/5" @ISO-800 under Skylight with Baader UVIR-Block Filter] Ultraviolet Light [f/11 for 20" @ISO-800 with 3 flashes from SB-140 UV-Flash and BaaderU UV-Pass Filter] Visible Light [f/11 for 1/4" @ISO-800 under Skylight with Baader UVIR-Block Filter] Ultraviolet Light [f/11 for 20" @ISO-800 with 3 flashes from SB-140 UV-Flash and BaaderU UV-Pass Filter] This selection was cropped from a larger photo. UV+Blue+Green [f/11 for 20" @ ISO-3200 under Skylight with U-330(2.0mm) + S8612(2.0mm)] Link to comment
Andy Perrin Posted January 26, 2021 Share Posted January 26, 2021 Hoary Tansy Aster sounds like a black sheep cousin in the Aster family tree! She gets around... Link to comment
Andrea B. Posted January 26, 2021 Author Share Posted January 26, 2021 oh halp! :lol: :lol: Link to comment
Andrea B. Posted January 31, 2021 Author Share Posted January 31, 2021 finished 30 jan 2021 Link to comment
Cadmium Posted January 31, 2021 Share Posted January 31, 2021 Andrea, Love the UV+Blue+Green shot(s), especially the first one. And also the UV shot. Link to comment
Andy Perrin Posted January 31, 2021 Share Posted January 31, 2021 The UV shot has fantastic colors. Link to comment
Andrea B. Posted January 21, 2022 Author Share Posted January 21, 2022 Updated 20 Jan 2022 Added SET 3. Link to comment
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