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Drosera obovata
Obovate-leaved Sundew
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Photographer: Dr. Amadej Trnkoczy
ID: 0000 0000 1118 0001 (2018-11-01)Copyright © 2018 Dr. Amadej Trnkoczy
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INFORMATION PROVIDED WITH THE PHOTO
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date of photo Aug 29, 2008
latitude 45.82724 longitude 14.59427
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location
Mišja dolina valley, southeast of settlement Logarji; next to the road toward Kaplanovo (Dolenjska, Slovenia)notes Slo.: dolgolistna x okroglolistna rosika (križanec) - syn.: Drosera longifolia subsp. obovata (Mert. & Koch), Drosera obovata Mert. & Koch - Habitat: semi ruderal, partly grass overgrown, wet ground near water ditch and local paved road; flat terrain; full sun; elevation 500 m (1.650 feet); average precipitations 1.500-1.700 mm/year, average temperature 8-9 deg C, Dinaric phytogeographical region. - Substratum: soil. - Comment: Drosera x obovata is a carnivorous sterile hybrid of parents Drosera anglica and Drosera rotundifolia and probably the rarest taxon of this genus in Slovenia. As all others it is a plant of wetlands and thus endangered, in decline and protected by law. - Distinguishing between different species of genus Drosera is not always easy in the field. The plants are variable and individual traits of different species frequently overlap (Ref. 1 and 2). Nevertheless, looking on these pictures it is evident that non-roundish leaves and flowering stalks, which are much longer than the longest leaves reliably eliminates Drosera rotundifolia and Drosera intermedia from a list of possible determinations. Between remaining two options in Slovenia – namely Drosera anglica and Drosera x obovata the last one seems considerably better. The Ref.:1 showed that the ratio between leaf blade length to its width is the most practical and reliable trait in distinguishing Drosera x obovata from its parents. Overage ratio specified in literature is 7 (Ref.:1) and 6 (Ref.: 2 and 3) for Drosera anglica and 3.2 (Ref. 1), 2.3 (Ref.: 2) and 2.5 (Ref.: 3) for Drosera x obovata. Measured ratio of the shown plant was 2.9 (SD=0.4, N=4). This clearly speaks in favor of Drosera x obovata. Also fruits seemed to be to some extent atrophied, or at least clearly not 'much longer than calix' as should be with Drosera anglica according to Ref.: 2. Two of five shown fruits on picture 10a have only slightly longer fruits than calyxes, remaining seem shorter and somewhat deformed. This too seems to support Drosera x obovata as proper determination. One of the parent – Drosera rotundifolia – was found very near this find. - Pravilnik o uvrstitvi ogroženih rastlinskih in živalskih vrst v rdeči seznam, Uradni list RS, št. 82/2002 (Regulation of enlisting of endangered plant and animal species onto Red List, Official Gazette of Republic Slovenia, no. 82/2002) (2002). Enlisted in the Slovene Red List of rare and endangered species, marked by 'V' representing a vulnerable species. - Ref.: (1) Y. Hoyo, S. Tsuyuzaki, Characteristics of leaf shapes among two parental Drosera species and a hybrid examined by canonical discriminant analysis and a hierarchical Bayesian model, American Journal of Botany 100(5) (2013); available at: https://onlinelibrary.wiley.com/doi/full/10.3732/ajb.1200510 (accessed Oct. 30 2018) (2) M.A. Fischer, W. Adler, K. Oswald, Exkursionsflora für Österreich, Liechtenstein und Südtirol, LO Landesmuseen, Linz, Austria (2005), p 385. (3) A. Martinči et all., Mala Flora Slovenije (Flora of Slovenia - Key) (in Slovenian), Tehnična Založba Slovenije (2007), p 242. (4) K. Lauber and G. Wagner, Flora Helvetica, 5. Auflage, Haupt (2012), p 696.camera Nikon D70 /Nikkor Micro 105mm/f2.8
contributor's ID # Bot_291/2008_DSC2740 photo category: Plant - annual/perennial
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MORE INFORMATION ABOUT THIS PLANT
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Obovate-leaved Sundew (photographer)
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