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Orobanche gracilis
Slender Broomrape
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Photographer: Dr. Amadej Trnkoczy
ID: 0000 0000 0614 1363 (2014-06-19)Copyright © 2014 Dr. Amadej Trnkoczy
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INFORMATION PROVIDED WITH THE PHOTO
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date of photo Jun 16, 2014
latitude 46.22191 longitude 13.60969
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location
River Soča valley, downstream of Idrsko village, right bank of river Soča, between the river and main road Kobarid-Tolmin, East Julian Alps (Posočje, Slovenia)notes Slo.: nežni pojalnik - syn.: Orobanche cruenta - Habitat: dry grassland, mowed once per year, flat terrain, calcareous ground, overgrown old river deposits, full sun, exposed to direct rain, average precipitations ~ 3.000 mm/year, average temperature 8-10 deg C, elevation 355 m (1.150 feet), alpine phytogeographical region. - Substratum: soil. - Comment: Members of the genus Orobanche s.lat (Broomrapes) are extraordinarily fascinating plants in a similar way as Orchids. They have no chlorophyll and take food from their hosts. Similar like Orchids, which can't grow without a symbiotic relation with fungi, Orobanche can't grow without pure parasitic relation with specific green plants. While with Orchids both participating partners have some kind of benefit from the common life, with Orobanche only they profit while the other side pays the bill. The hosts regularly remain underdeveloped and crippled and do not bloom. - In general Orobanche can be considered as a quite rare plant in nature, particularly some species of this genus. They are far of being numerous or aggressive and therefore their parasitic life style does not 'harm' nature significantly. However, this ceases to be true when men start to 'arrange' nature - in agriculture. Some species of this genus have become real plagues and large monoculture fields can be totally devastated by them. The reason lies in the way of their propagation. A single plant can produce up to several hundred thousand of seeds, which are like dust and among the smallest in the world. But, a seed can germinate only in case that the wind deposits it directly on the roots of a sometimes very specific host plant. So, only very, very small percentage of these seeds actually germinates thus keeping the number of new plants in proportions. Not so in large agricultural fields. Unfortunately, several suitable host plants are at the same time also agriculturally important. In such fields there are plenty of host's roots there; actually each root is just the right one for the seeds. Consequently Orobanche plants may occur in stands numbering millions and crop plants are 'suck' dry unable to flower and produce fruit. Instead of fields full of tobacco or clover a flood of these botanical 'rarities' is the result. - Determination of plants to species level in this genus is difficult from several reasons. But, in spite of the fact that Orobanche gracilis is very variable plant (size, color, etc), it is actually an exception in this respect. It can be relatively easily recognized by unique blood red inner side of corolla and bright yellow stigma having a purple red margin. Its hosts are numerous and thus of little help in determination because it parasitizes on many plants of several genera within the large pea famili (Fabaceae). - Ref.: (1) M.A. Fischer, W. Adler, K. Oswald, Exkursionsflora Österreich Liechtenstein, Südtirol, LO Landesmuseen, Linz, Austria (2005), p 757. (2) A. Martinči et all., Mala Flora Slovenije, Tehnična Založba Slovenije (2007) (in Slovene), p 573. (3) C.A.J. Kreutz, Orobanche, The European broomrape species: a field guide, Natuurhistorisch Genootschap Limburg, NL (1995), p 100.camera Canon G11, 6.1-30mm/f2.8-4.5
contributor's ID # Bot_805/2014_DSC1242 photo category: Plant - annual/perennial
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MORE INFORMATION ABOUT THIS PLANT
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| common names
Slender Broomrape (photographer)
View all photos in CalPhotos of Orobanche gracilis Check Google Images for Orobanche gracilis |
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The photographer's identification Orobanche gracilis 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 © 2014 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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