engleski

New localities of Alyssum montanum L. ssp. pluscanescens (Raim. ex Baumgartner) Trpin (Brassicaceae) outside of special reserve Brežuljak kod Smerovišća and new threat category proposed

Samobor alyssum (Alyssum montanum L. ssp. pluscanescens (Raim. ex Baumgartner) Trpin) is an endemic taxon from the family Brassicaceae. According to the Red Book of Vascular Flora of Croatia it is considered Critically Endangered and therefore it is strictly protected by the Nature Protection Act. Its area of distribution encompasses only Slovenia and Croatia. The only one locality in Slovenia is its locus classicus in the quarry Žiče in the municipality Slovenske Konjice (Styria), which is protected as natural monument. In Croatia it was only known from the special botanical reserve Brežuljak kod Smerovišća, near Samobor (Zagreb County), where this reserve also partly encompasses quarry. In the year 2015 during the reconnaissance of the wider area, three new localities of Samobor alyssum, outside of special reserve, but in its proximity, were discovered. Two of newly recorded localities are situated in the same quarry, while one is located in the neighbouring quarry. In the year 2016 all localities were visited and the number of individuals of Samobor alyssum on each locality was estimated. Previously known locality in the special reserve is the smallest in terms of area size and number of individuals, while the locality in another quarry is the largest in area size and the richest in number of individuals. By the application of the criteria for IUCN Red List Categories, we suggest to reassign Samobor alyssum to a lower category of threat i.e. to downlist it from Critically Endangered (CR) to Endangered, EN B1ab(iii)+2ab(iii). According to the Unified Classification of Direct Threats of IUCN, 3.2 Mining & quarrying and 9.4 Garbage & solid waste are the most important direct threats to Samobor alyssum. Since most of the population of Samobor alyssum is currently outside of the special reserve, we believe that it is necessary to expand its borders, in order to protect all localities of this rare taxon, including also the surrounding forest vegetation.

Samobor alyssum; endemic plant species; red list category

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