Andrea B. Posted July 17, 2013 Share Posted July 17, 2013 Blum, A.G. (2013) Ranunculus glaberrimus Hooker var. ellipticus (Greene) Greene (Ranunculaceae) Elliptical Buttercup. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...tical-buttercup Twin Pines, LaPlata County, Colorado, USA28 March 2013Wildflower Synonyms:Early ButtercupSagebrush ButtercupRanunculus ellipticus GreeneRanunculus glaberrimus Hook. var. buddii B. BoivinComments:Native to the western US and Canada. R.g. var. ellipticus is distinguished from R.g. var. glaberimmus, which does not grow in Colordo, by having a longer middle lobe on its 3-lobed stem leaves (bracts). The glossy distal end of a buttercup petal is water repellant while the duller proximal portion is not. This is thought to be support for a rainwater pollination stragegy.(3) Like most buttercups in UV, the Elliptical Buttercup is iridescent and shiny and features a UV-black central pattern with UV-bright petal tips. The foliage is also very UV-dark. Reference:1. Natural Resources Conservation Service (2013) Ranunculus glabberimus Plant Profile. US Department of Agriculture. http://plants.usda.g...ile?symbol=RAGL2. Weber & Wittmann (2012) Ranunculus L, page 314. Colorado Flora: Western Slope, 4th Ed. The U. of Colo. Press, Boulder, CO.3. Benson, Lyman (1962) Plant Taxonomy: Methods and Principles, Ronald Press, New York, NY Equipment [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor] Visible Light [f/8 for 1/1250" @ ISO 200 in Sunlight with Baader UVIR-Block Filter] Visible Light [f/7.1 for 1/800" @ ISO 200 in Sunlight with Baader UVIR-Block Filter] Ultraviolet Light [f/8 for 1/160" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter] Ultraviolet Light [f/11 for 1/125" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter] Link to comment
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