Abstract
This tenth part of floristic contributions includes newly published data of criticaly endangered species and data unpublished so far. Data of taxa newly discovered in the Czech Republic (Dryopteris cambrensis, Hieracium visianii, Orobanche kochii, Potamogeton x cooperi, P. x nitens, P. x olivaceus, P. x sparganiifolius, P. x undulatus, Rubus sorbicus, Scilla bifolia subsp. buekkensis and subsp. spetana) and data of alien species found in the Czech Republic for the first time (Galium murale, Hypericum annulatum, Pimpinella peregrina and Trachyspermum ammi) are summarised.
Finds of Scilla bifolia subsp. rara, a subspecies described from the Czech Republic as new to science, are also listed below. Furthermore, critically endangered species (according to theBlack andRed List ofVascular Plants of theCzechRepublic) are reported fromnewsites (e.g.
Aira caryophyllea, Ajuga pyramidalis, Arnoseris minima, Asplenium adulterinum, Botrychium matricariifolium, Bromus arvensis, B. secalinus subsp. secalinus, Campanula cervicaria, Conioselinum tataricum, Conringia orientalis, Diphasiastrumtristachyum,Draba nemorosa, Epipactismicrophylla, E. neglecta, Erysimumrepandum, Festuca amethystina, Filago vulgaris, Gentianella amarella subsp. amarella, G. obtusifolia subsp. sturmiana, G. praecox subsp. bohemica, Geranium divaricatum, Hackelia deflexa, Hierochloë odorata, Juncus sphaerocarpus, Misopates orontium,Montia fontana, Najas minor, Orchis ustulata subsp. ustulata, Orobanche arenaria, O. picridis,O. purpurea subsp. purpurea, Polycnemumarvense, Pyrola chlorantha, P.media, Scrophularia vernalis, Senecio erucifolius, Thesium arvense, T. dollineri, Thymus pulegioides subsp. carniolicus, Tofieldia calyculata, Torilis arvensis, Trapa natans, Viola elatior, Xanthium strumarium). Finally, rare and threatened species are mentioned from areas where they had not been recorded yet.