Andrea B. Posted June 16, 2014 Share Posted June 16, 2014 Blum, Andrea G (2018) Ranunculus bulbosus L. (Ranunculaceae) Bulbous Buttercup. Flowers photographed in ultraviolet, visible and infrared light. Photos made with UV+Blue+Green filtration also shown. http://www.ultraviol...ping-buttercup/ Other Common Names:Knolliger Hahnenfuß ('Knobby Cocksfoot', German)Knollsoleie (Norwegian)Knölsmörblomma ('Lumpy Butterflower', Swedish)St. Anthony's Turnip (because of the swollen bulbous base).Comment:Ranunculus bulbosus, a common Eastern North American introduced weed, is a European native. In Norway it is rare and red-listed as a vulnerable species. We found some growing in a cemetery in Mandal, Southern Norway where I photographed it in the rain, not an easy task. Look at Set 2 for those. Here in the US where I live, R. bulbosus is a common sight in springtime. The photos in Set 1 show a flower taken from a grassy area near a convenience store which has subsequently been mowed. Set 3 shows an R. bulbosus growning amongst clover in a local park. R. bulbosus flashes many specular highlights in all wavelengths due to the waxy surface of its petals. It reflects some UV from its upper petals but not enough to brighten the rather dull false grey-yellow seen in the following UV photos. The abaxial side of the corolla is UV-dark. The reproductive center parts are UV-black. The pollen on the anthers is UV-bright. Reference:1. Den virtuella floran (2014) Knölsmörblomma. Ranunculus bulbosus L. http://linnaeus.nrm....un/ranubul.html2. Norsk Rødliste for Arter (2010) Artsdatabanken, Norwegian Biodiversity Information Centre, Trondheim, Norway, page 173. http://www.biodiversity.no/Norsk_rødliste_for_arter_2010_pjuZH.pdf.file3. New England Wild Flower Society (2018) Ranunculus bulbosus L. Bulbous Buttercup. LINK SET 1Middletown, New Jersey, USA15 May 2018Wildflower R. bulbosus plant in weedy strip of grass along with some veronica and dandelions. Equipment [Nikon D610-broadband + Carl Zeiss 60mm f/4.0 UV-Planar] All photos except the pollen details may be clicked up to 1200 pixels wide. Visible Light [f/11 for 1/15" @ ISO-400 with Onboard Flash and Baader UVIR-Block Filter] Ultraviolet Light [f/11 for 3" @ ISO-400 with SB-14 UV-modified Flash and BaaderU UV-Pass Filter] UV+Blue+Green [f/11 for 2" @ ISO-1600 in Sunlight with UG5(1.5mm) + S8612(2.00mm)] Visible Light [f/11 for 1/25" @ ISO-400 with Onboard Flash and Baader UVIR-Block Filter] Ultraviolet Light [f/11 for 3" @ ISO-400 with SB-14 UV-modified Flash and BaaderU UV-Pass Filter] UV+Blue+Green [f/11 for 4" @ ISO-400 in Sunlight with UG5(1.5mm) + S8612(2.00mm)] Visible Light [f/8 for 1/4" @ ISO-100 with Onboard Flash and Baader UVIR-Block Filter] Ultraviolet Light [f/8 for 8" @ ISO-400 with SB-14 UV-modified Flash and StraightEdge UV-Pass Filter]Two flashes were made during the 8" interval. Ultraviolet Light [f/8 for 10" @ ISO-400 with SB-14 UV-modified Flash and MoonOverMiami UV-Pass Filter]Two flashes were made during the 10" interval. This filter stack passes a bit of violet/blue which I could bring out in the converter. The breezes have created a bit of motion blur in the anthers, but I wanted to show the photo anyway. Infrared Light [f/16 for 1.3" @ ISO-100 in Sunlight with RG665(2.00mm) IR-Pass Filter]That is not sensor dirt, that is flower dirt. The buttercup has a nice false-cyan glowy inner base. Ultraviolet Light [Excerpts from original-sized UV photos showing pollen details] Visible Light [f/11 for 1/2.5" @ ISO-400 with Onboard Flash and Baader UVIR-Block Filter] Ultraviolet Light [f/11 for 2.5" @ ISO-400 with SB-14 UV-modified Flash and BaaderU UV-Pass Filter]Bad shadows! But I thought it would be interesting to see a close leaf study in UV. Link to comment
Andrea B. Posted May 16, 2018 Author Share Posted May 16, 2018 SET 2Mandal, Norway07 May 2014Wildflower Equipment [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor] These photographs were all made in the rain, in a graveyard, while Bjørn and Kai stood by chuckling at my ergonomics after getting down on the sodden grass to make thse shots! Shooting in the rain tends to provide an artistic interpretation of a UV-signature rather than a documentary view. I really like them though. The various optical effects from the raindrops were quite interesting. Visible Light [f/16 for 1/200" @ ISO-100 with Onboard Flash and Baader UVIR-Block Filter]When I began shooting there was only drizzle and still a fair amount of light. That did not last. Ultraviolet Light [f/16 for 1/50" @ ISO-400 with SB-140 UV-Flash and Baader UV-Pass Filter]Remember, R. bulbosus does not have a vibrant false colour. Its face exhibits a kind of muddy false grey-yellow. The abaxial side is much darker. Visible Light [f/16 for 1/40" @ ISO-100 with Onboard Flash and Baader UVIR-Block Filter]We were beginning to lose the light. Went from 1/200" to 1/40". Ultraviolet Light [f/16 for 1/30" @ ISO-400 with SB-140 UV-Flash and Baader UV-Pass Filter]It is only about 3 minutes later than when the previous photo was made, but it was getting darker and rainier. You can say that I should have boosted the ISO, but I so hate the noise that can occur in UV photos. I actually made a 15" exposure ambient light exposure (shown next) but it did not markedly improve the outcome except for perhaps fewer specular reflections off of the shiny buttercup than the version posted here. Ultraviolet Light [f/16 for 15" @ ISO-100 in ambient light with Baader UV-Pass Filter]One more abaxial view. Without the SB-140 flash, there isn't much contrast in the very dull ambient light. And I couldn't pull much false colour from this file. That buttercup on the left has a lot of rainwater in its base. It still surprises me that I got a 15" shot at ISO-100. I don't remember for sure, but maybe the rain had slowed up so that the drops weren't moving the flowers. Although you can see a little bit of motion in the left petals of the right-most flower. Link to comment
Andrea B. Posted April 17, 2021 Author Share Posted April 17, 2021 SET 3Deep Cut Gardens, Middletown, New Jersey, USA15 May 2013Wildflower Equipment [Nikon D600-broadband + Carl Zeiss 60mm f/4.0 UV-Planar on Helicoid] Visible Light [f/11 for 1/50" @ ISO-200 in Sunlight with Baader UVIR-Block Filter]This is approximately a 30% crop from the full frame. Visible LightThe folded sepals are a key identification point for R. bulbosus. Visible LightR. bulbosus is a host plant for some unidentified caterpillar. Ultraviolet Light [f/11 for 1/60" @ ISO-400 with SB-14 UV-modified Flash and BaaderU UV-Pass Filter] Link to comment
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