Moprhology and anatomy of Crocus speciosus Bieb. subsp. speciosus, C. speciosus Bieb. subsp. ilgazensis, C. speciosus subsp. xantholaimos were done. Two of them (subsp. ilgazensis and xantholaimos) are endemic to small areas of Turkey. The subsp. xantholaimos has flowers with tube stained yellow. The subsp. ilgazensis has a corm splitting into vertical fibres. These properties are characteristic for the two subspecies investigated. Cross-sections of root and aerial stem of three subspecies were examined and characterized. A key to the identification of the three taxa, based solely on anatomical features is provided here.
Materials and methods
Study area, sampling, and chemical analysisThree swamp forests were studied in the Central Black Sea region of Turkey (Figure 1). The first forest, known as Hacı Osman Forest (41°18′N, 36°55′E), covers approximately Abstract: Ellenberg developed a system that assigns indicator scores for habitat characteristics of individual plant species. Swamp forests are highly diverse ecological communities and include different plant species, all of which have different ecological requirements. Ellenberg's indicator values (EIVs) were calculated for soil pH and nitrogen (N) concentration in some swamp forest species in the Central Black Sea region of Turkey. In this study, the EIVs for soil pH were usually similar in the swamp forest species studied, while some differences were found with respect to EIVs for soil nitrogen concentration. Tolerance values (TVs) of all of the studied species were higher than those reported in similar studies because EIVs and species abundance were high in the present study compared to similar studies. TVs (soil pH) were higher in Galeriç Forest than in the other 2 swamp forests. The differences among the swamp forest species studied with respect to EIVs might be explained on the basis of soil heterogeneity, even on a local scale.
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