Andrea B. Posted May 22, 2015 Share Posted May 22, 2015 Blum, A.G. (2015) Oxalis violacea L. (Oxalidaceae) Violet Wood Sorrel. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...et-wood-sorrel/ Boyce Thompson Arboretum, Superior, Arizona, USA24 April 2013Wildflower in botanical garden Synonyms:Ionoxalis violacea (L.) SmallOxalis violacea L. var. trichophora FassettSassia violacea (L.) HolubComment:Rarely found in the wild, O. violacea thrives in shaded gardens. Like other Oxalis, the edible leaves, often used in salads, have a tart lemony tang. It also has the typical UV-absorbing striped throat. Reference:1. New England Wild Flower Society (2015) Oxalis violacea L. Violet Wood Sorrel https://gobotany.new...xalis/violacea/ Equipment [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor] Visible Light [f/11 for 1/200" @ ISO-400 in Sunlight with Baader UVIR-Block Filter] Ultraviolet Light [f/11 for 1/200" @ 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]The shamrock-like leaf of O. violacea. Note the bumps of oxalate crystals around the edges of the leaf. Link to comment
nfoto Posted May 22, 2015 Share Posted May 22, 2015 Interesting. This species of Oxalis behaves very similar to say a Geranium sylvaticum or G. pratense by having highly UV-reflective petals the veins of which are UV-dark. I found some old material of O. tetraphylla, another violet-flowered member, which in UV appeared similar to the white-flowering O. acetosella instead. Thus it seems almost impossible to predict a UV response from the flower colour as such. Link to comment
colinbm Posted May 23, 2015 Share Posted May 23, 2015 Nice presentation, AndreaDo those crystals sting ?Col Link to comment
nfoto Posted May 23, 2015 Share Posted May 23, 2015 No, they don't. This is not in any manner similar to the nettles and their stinging allies. The massive content of oxalic acid might make these species less palatable to herbivores though. Link to comment
Andrea B. Posted May 24, 2015 Author Share Posted May 24, 2015 No, I've handled the leaves of several types of Oxalis with no harm. Link to comment
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