Andrea B. Posted May 9, 2013 Share Posted May 9, 2013 Blum, A.G. (2013) Opuntia macrocentra Engelmann (Cactaceae) Black-spined Pricklypear. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...d-pricklypear/ Desert Botanical Garden, Phoenix, Arizona, USA22 April 2013Wildflower in botanical garden Synonyms:Purple PricklypearLong-spined PricklypearOpuntia violacea Engelmann ex B. D. JacksonO. violacea var. castetteri L. D. BensonO. violacea var. macrocentra (Engelmann) L. D. BensonComment: Reference:1. Flora of North America Online (2013) Opuntia macrocentra Engelmann, vol. 4. FNA. New York & Oxford. http://www.efloras.o...on_id=2424152032. Desert Botanical Garden, Phoenix, Arizona, USA Equipment [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor] Visible Light [f/6.3 for 1/640" @ ISO 100 using Nikon Coolpix A] Visible Light [f/8 for 1/400" @ ISO 100 in Sunlight with Baader UVIR-Block Filter] Ultraviolet Light [f/4.5 for 1/30" @ ISO 1270 with SB-14 UV-modified Flash and Baader UV-Pass Filter] Link to comment
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