engleski

Invasive alien plant taxa within Herbarium Croaticum and Herbarium Ivo and Marija Horvat

The oldest and largest herbarium collections in Croatia, Herbarium Croaticum (ZA) with over 200.000 specimens, and Herbarium Ivo and Marija Horvat (ZAHO) with almost 78.000 specimens, incorporate valuable data on invasive alien plant taxa in Croatia. Following the new trend in the herbaria worldwide, the digitisation of the collections in the aforementioned herbaria has recently begun. The invasive alien plants were digitised and analysed during 2018, in order to present the taxonomical, spatial and temporal data. All herbarium sheets were digitised and georeferenced within GIS environment, while the metadata were deposited and published in Flora Croatica Database (FCD). The analysis revealed as many as 1062 herbarium sheets containing invasive alien plant taxa within the ZA collection, including 70 out of the 75 taxa currently listed as invasive in Croatia (Nikolić, 2018). The most often collected species is Veronica persica, while the most prolific contributors are Ljerka Marković, Vedran Šegota and Ludovico Rossi. Only 43 herbarium sheets containing 16 invasive alien taxa were found in the ZAHO collection. The species Amaranthus blitoides, Conyza sumatrensis, Epilobium ciliatum, Opuntia ficus-indica and Reynoutria sachalinensis were not found in any collection, although they were frequently reported in the literature. The majority of analysed examples originated from Croatia and neighbouring countries. The oldest sheet in ZA dates back to 1851, however as much as 67 % of the collection has been collected from the Second World War onwards. Completion of the digitising process, including scanning and uploading into publically available FCD and ZA & ZAHO Virtual Herbaria is planned for 2019.

digitisation ; alien species ; botanical collections ; virtual herbarium

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