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The nomenclatural analysis included 12 autochthonous and mostly endemic species from the genera Atocion Adans., Cerastium L., Heliosperma (Rchb.) Rchb., and Silene L. (Caryophyllaceae). In conformity with ICBN, 12 new infra?specific taxa are described with locus classicus on the territory of Serbia. Also presented are 24 new nomenclatural combi?nations, including several for endemic taxa not present in Serbia. The nomenclature of certain taxa is supplemented by a short taxonomic-chorological review. Results of these studies will be incorporated in the next volume of "Flora of Serbia".

We present the distribution of 10 threatened or rare plant species in Serbia based on field research and herbarium and literature data. These taxa are mapped on 10 x 10 km2 UTM grids. The following taxa are analyzed: Crepis nicaeensis Balbis, Lamium hybridum Vill., Lathyrus inconspicuus L., Kitaibela vitifolia Willd., Lindernia palustris Hartm., Veronica dillenii Crantz, Cyperus pannonicus Jacq., Milium vernale Bieb., Epipactis microphylla (Ehrh.) Swartz, and Epipogium aphyllum Swartz. For each species, the IUCN threatened status in Serbia is given; on the basis of these estimates it is proposed that eight plants be included in the next edition of the Red Data Book of the Flora of Serbia.

During field studies carried out in the territory of NW Serbia - the Pocerina region (Knic village) and surrounding of Valjevo (Divci village) in 2004 we collected some specimens of the genus Gagea and identified as G. spathacea (Hayne) Salisb. A review of the literature data revealed that this taxon has not been yet recorded for the flora of Serbia.