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Roses (Rosa sp. L.) belong to the oldest grown ornamental plants. The oldest mention of rose growing is reported in the South-East Asia from where roses gradually expanded through the Middle East to the Mediterranean area and Europe (Večeřa et al., 1967; Karahan, 2005; Çinar, 2005). Large development of cultivation was recorded in ancient Rome. They did grow them not only for their beauty but also for the benefit (Joublan et al., 1996; Ježovič and Lukáčik, 2011). The application of roses in planting arrangements does not have a long tradition in Slovakia; even though natural conditions are quite favourable for their cultivation there is a lack of domestic producers of rose seedlings, including botanical species. Nonetheless, we found botanical species regarding the ecological requirement for suitable primarily on degraded soils (Feriancová, Števulová 1997). Roses are especially popular with the beauty of flowers, their shape, richness of flowering and colour range. They are variable in shape, too (Večeřa et al., 1967; Karahan, 2005). The area of roses extends solely to the northern hemisphere. Their spread in individual continents is almost equal, but the most original species still grow in Asia, in China (Větvička, Krejčová, 2001). Some roses have an endemic appearance, like section Carolinae in North America, or on the other side, the vast area is occupied by Rosa canina L., some have only a point occurrence, for example Rosa glauca and Rosa × reversa. The Zobor Hills are one of the five separate groups of the Tribeč mountain range. From the floral point of view, they are the richest territories. They represent valuable natural values important from a scientific, conservation and aesthetic points of view. The hill Zobor (587 m above sea level), is almost in the middle of the Tribeč mountain range. Varied geological conditions have given room for the expansion of diverse habitat types with many rare species of plants and animals. From this point of view, the Zobor Hills are the most valuable part in the Protected Landscape Area of Ponitrie (Svobodová, 1980). The previous floristic surveys of the Zobor Hills were carried out by Knapp in 1863, Klášterský in 1934–1935, Klášterská in 1969, Deyl in 1947, Větvička and Višňovská in 1977, Řehořek et al. (2007), Kerényi-Nagy and Baranec (2008) and Kerényi-Nagy, Eliáš and Baranec (2008). We focused on surveys made by Řehořek et al. (2007), Kerényi-Nagy and Baranec (2008) and KerényiNagy, Eliáš and Baranec (2008). Roses do not belong to long-lasting woody plants, but they have undoubtedly very high importance in landscaping. Botanical species, which we focused on at evaluated localities, have a great landscape and horticultural potential. RECOMMENDED ROSA SP. L. SPECIES IN THE GREEN SPACES OF NITRA CITY ON THE BASIS OF THEIR AESTHETIC VALUE AND ECOLOGICAL REQUIREMENTS

Recommended Rosa sp. L. Species in the Green Spaces of Nitra City on the Basis of Their Aesthetic Value and Ecological Requirements