Properties of marginal population of Iris aphylla (Iridaceae) in the Biebrza National Park (north east Poland). Fragmenta Floristica et Geobotanica Polonica 10: 195–207. Kraków. PL ISSN 1640 629X. ABSTRACT: In the years 1997–2001 marginal population of Iris aphylla L. in the Biebrza National Park was investigated. The aims of study were to characterize population size, morphological traits, architecture, age structure of rhizomes and type of reproduction. During four years of observations fluctuations in numbers of rosettes (about 5–30%), significant differentiation in number of leaves in rosettes, size of leaves and height of flowering shoots were observed. Only 1.3%–2.7% of shoots flowered (without fruits). Positive significant relationship between morphological traits and length and age of rhizomes were noted.
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