The paper describes the flora and plant communities of the nature reserve “Uroczysko Obiszów” on Wzgórza Dalkowskie Hills (Wzgórza Trzebnicko- Ostrzeszowskie Hills, Lower Silesia). A full index of plants recorded in the reserve comprises 217 species. The most interesting include Epipactis albensis and five montane species: Senecio fuchsii, Dryopteris dilatata, Sambucus racemosa, Prenanthes purpurea,Valeriana sambucifolia. Lycopodium annotinum, which was noted in 1973 is extinct. Four plant communities occur here, i.e. oak-hornbeam forest (Galio sylvatici- Carpinetum), alder forest (Fraxino-Alnetum), soft water streams’ community of Caricetum remotae and grass-sedges community with Carex acutiformis. The oak-horbnbeamforest, which covers about 90% of an area, is very well preserved and is the most valuable community in the reserve “Uroczysko Obiszów”.