nfoto Posted June 4, 2015 Share Posted June 4, 2015 Rørslett, B. 2015. Orobanche gracilis Sm. (Orobanchaceae) Slender Broomrape. Flowers photographed in ultraviolet and visible light. http://www.ultravioletphotography.com/content/index.php/topic/1408-orobanche-gracilis-slender-broomrape/ Orobanche gracilis belongs to a large, parasitic genus with a near Cosmopolitan distribution. It is a European species and one out of twenty Orobanche species found in Slovenia. These plants are entirely without chlorophyll and are seen as leafless stems emerging with clusters or spikes of quite small flowers of an intricate and complex design. They parasitize roots of many vascular plants and most species are confined to a single or a few hosts. The flowers of O. gracilis smell a little sickly and unpleasantly sweet. Perhaps the flowers are pollinated by small flies or beetles? Plants photographed in a dry upland meadow at Bohinje Jezero, Slovenia, 4 June 2015. The host plants were Trifolium spp. Image reference: OROB_GRAC_G1506045545_VISVisible light: Nikon Df, Noct-Nikkor 58 mm f/1.2 lens Image reference: OROB_GRAC_I1506042373_UVUltraviolet light: Nikon D3200 (internal Baader U2" filter), Coastal Optics 60 mm f/4 APO lens, SB-140 flash In UV, greater diversity in [false] colours is seen. There are UV-reflective parts around the entrance to the corolla throat. [ Published 5 June 2015 ] Link to comment
nfoto Posted June 5, 2015 Author Share Posted June 5, 2015 Host plants at this location subsequently were identified as Trifolium pratense and T. montanum. I think now pollinators must be bigger creatures than small flies as postulated earlier. Still, the emitted pungent scent indicates some kind of specialisation strategy. Link to comment
Andrea B. Posted June 5, 2015 Share Posted June 5, 2015 I searched a bit and found mention of bees or bumblebees for some Orobanche.Also some speculation about self-pollination. This example is one of the prettier species of Orobanche I've seen.And the Noct certainly gives a nice portrait of it. Looks like you were around f/2 - f/4 ?? Link to comment
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