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Rosa arvensis
Field Rose
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Photographer: Dr. Amadej Trnkoczy
ID: 0000 0000 0316 3451 (2016-03-30)Copyright © 2016 Dr. Amadej Trnkoczy
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INFORMATION PROVIDED WITH THE PHOTO
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date of photo Jul 15, 2008
latitude 46.26316 longitude 13.52651
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location
Close to the top of Mt. Kobariški Stol ridge, above the dirt road, near mountain cottage on Mt. Starijski vrh, East Julian Alps (Posočje, Slovenia)notes Slo.: njivski šipek - Habitat: former pasture, grassland partly overgrown with bushes and scattered Fagus Sylvatica, moderately inclined mountain slope near the top of a rounded mountain ridge; south aspect, sunny and dry place; calcareous, skeletal ground, exposed to direct rain; elevation 1.130 m (3.700 feet); average precipitations ~ 3.000 mm/year, average temperature 4-6 deg C, alpine phytogeographical region. Substratum: soil. Comment: Genus of roses (Rosa) is very beautiful. But it is taxonomically difficult. There are over hundred wild growing species known (hundreds of cultivars not taken into account, of cause), well over twenty are growing in Slovenia. More accurate numbers depend on to which botanical 'school one belongs'. Very frequent and numerous hybrids make determination of wild roses a 'small science by itself' like in genera Rubus, Alchemilla, Hieracium and some others. Only pros dedicate to a particular genus know, how to tell species, subspecies, varieties, forms and hybrids apart. For reliable determination of Rosa taxons one needs to study young shots and mature branches, leaves, flowers and hips in different stage of development. Such details like shape, size and distribution of spines, calyx leaves and their position after flowering is over (do they remain pointing radially, straight ahead or bend back, do they fall off early or late or not at all), hairiness of fruits, leaves, pistils, etc. must be taken into account. And, in addition, these entire traits are variable. In many cases one needs to visit a rose bush more than once in different seasons. Fortunately, Rosa arvensis seems an easy case for determination. Its typical long, glabrous pistils (almost as long as stamens), which are fused together into an inseparable bundle (see picture 6) and non-shining green leaves determine it well. In addition to Rosa arvensis such pistils are characteristic only for (also white blooming) Rosa sempervires. But the latter has distinctly shiny leaves and, doesn't grow in Alpine phytogeographical region of Slovenia but only in southwest part of it in warmer submediterranean phytogeographical region. Hence the determination of this find seems quite reliable. Ref.: (1) M.A. Fischer, W. Adler, K. Oswald, Exkursionsflora für Österreich, Liechtenstein und Südtirol, LO Landesmuseen, Linz, Austria (2005), p 521. (2) A. Martinči et all., Mala Flora Slovenije (Flora of Slovenia - Key) (in Slovenian), Tehnična Založba Slovenije (2007), p 276. (3) E.J. Jäger, Rothmaler 3, Exkursionsflora von Deutschland, 11. Aufl., Elsevier, Spectrum (2007), p 230. (4) D. Aeschimann, K. Lauber, D.M. Moser, J.P. Theurillat, Flora Alpina, Vol. 1., Haupt (2004), p 736.camera Nikon D70 / AF-S Nikorr 18-70mm/f3.5-4.5G ED / Nikorr Micro 105mm/f2.8
contributor's ID # Bot_282/2008_DSC1486 photo category: Plant - annual/perennial
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MORE INFORMATION ABOUT THIS PLANT
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Field Rose (photographer)
View all photos in CalPhotos of Rosa arvensis Check Google Images for Rosa arvensis |
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The photographer's identification Rosa arvensis has not been reviewed. Click here to review or comment on the identification. |
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Using this photo The thumbnail photo (128x192 pixels) on this page may be freely used for personal or academic purposes without prior permission under the Fair Use provisions of US copyright law as long as the photo is clearly credited with © 2016 Dr. Amadej Trnkoczy.
For other uses, or if you have questions, contact Dr. Amadej Trnkoczy amadej.trnkoczy[AT]siol.net. (Replace the [AT] with the @ symbol before sending an email.) |
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