The vegetation and flora of tbe Halsviksravinen nature reserve (prov. Ångermanland, E Central Sweden) is described. The Halsviksravinen is a narrow valley leading down to the sea; the total area is c. 0.5 km2. The bedrock in the surrounding mountains is diabase which, together with the good supply of seepage water, makes soil conditions extremely favourable. The area is nowadays forested, but was previously used for hay production and grazing. Picea abies usually dominates, sometimes mixed with deciduous species. Pure stands of deciduous species also occur, especiaUy near brooks. The field layer is dominated by herbs except for in the driest areas where communities with Vaccinium species predominate. The area is rich in southem species, many of which reach or come close to their NE limit in Sweden here, e.g. Acer platanoides, Anemone nemorosa, Calamagrostis arundinacea, Campanula latifolia, C. persicifolia, Corydalis intermedia, Dentaria bulbifera, Festuca altissima, Gagea lutea, Galium odoratum, Geranium robertianum, Geum urbanum, Juncus conglomeratus, Lactuca mura/is, Lathyrus vernus, Lonicera xylosteum, Neottia nidus-avis, Stachys sylvatica and Vicia sylvatica. Nature conservancy measures will include selective tree-felling to favour the growth of deciduous species as well as spruce; smaller parts will be left to develop spontaneously towards conditions resembling those in primary forest. Lichens are occassionallz mentioned in the text and a photograph of Ophioparma ventosa (as Haematomma ventosum) is provided.