Changes in dendroflora of the Dendrological Garden in Lipno (Opolskie Voivodeship).
In this paper we compared the results of the inventory of the dendroflora of the Dendrological Garden in Lip- no, from 2012 and 2015 with the data from the two earlier inventories from 1952 and 1977. Currently, 112 taxa of woody plants belonging to 65 genera and 33 families grow in the garden. Most of them are trees (59.8%). Alien species and varieties of woody plants dominate (67.9%) over the native taxa (32.1%). In this object four monumental trees are found. The most valuable woody plants are Ginkgo biloba, Juniperus virginiana, Thuja plicata, Liriodendron tulipifera, Liquidambar styraciflua and Cercidiphyllum japonicum. In 60 year time 53 taxa recorded during the earlier inventories became extinct. The collection of this valuable arboretum, founded in 1782, needs to be supplemented and enriched with woody plants species selected on the basis of their collectible value.