Distributions of vascular plants in the Czech Republic. Part 6.
The sixth part of the series on the distributions of vascular plants in the Czech Republic includes grid maps of 112 taxa in the genera Athyrium, Carex, Centaurea, Chenopodium, Corispermum, Corrigiola, Crepis, Cystopteris, Glaucium, Hackelia, Hammarbya, Hippocrepis, Lappula, Lepidium, Liparis, Loranthus, Lycopus, Lythrum, Matteuccia, Osmunda, Plantago, Psephellus, Pteridium, Salvia, Scirpus and Viola. These maps were produced by taxonomic experts based on examined herbarium specimens, literature and field records. The native species include common and widespread plants such as Athyrium filix-femina, Carex acuta, Crepis biennis, Lycopus europaeus, Lythrum salicaria and Plantago lanceolata, as well as rare species such as Carex buxbaumii, Osmunda regalis and Viola alba. Almost 42% of the mapped taxa are on the national Red List. Among themapped taxa there are rare mountain species (e.g. Carex aterrima, C. atrata, Centaurea mollis, C. montana, Crepis mollis subsp. mollis, C. sibirica and the endemic Plantago atrata subsp. sudetica), wetland orchids (Hammarbya paludosa, Liparis loeselii) and plants of dry grasslands (e.g. Crepis pannonica, Hippocrepis comosa, Lappula semicincta and Salvia aethiopis). Rare ecological specialists include Corrigiola litoralis from seasonally exposed sand and gravel bars in rivers, Plantago arenaria confined to dry open sandy habitats, and Chenopodium chenopodioides and Plantago maritima subsp. ciliata from saline habitats. Alien species mapped in this paper include both archaeophytes and neophytes, most of them from the genera Centaurea, Crepis and Lepidium. Salvia hispanica is recorded as a new alien species for this country's flora; its spontaneous occurrence was first detected in 2013, and since then this species has been found at about a dozen sites. Plantago coronopus has recently spread along the roads treated with de-icing salt. A number of species are at the limits of their distributions in the Czech Republic. The distribution maps of three interspecific hybrids are also included. Spatial distributions and often also temporal dynamics of individual taxa are shown in maps and documented by records included in the Pladias database and available in electronic appendices. The maps are accompanied by comments that include additional information on the distribution, habitats, taxonomy and biology of the taxa.