list of a few of the rarer Orkney plants, with some of their localities. Thalictrum Alpinum Hills of Hoy, Orphir, Rousay. Thalictrum Dunense Links, in Walls, Deerness, Sanday. Ranunculus Sceleratus Stromness. Nasturtium Palustre North Ronaldshay. Sisymbrium Thalianum Kirkwall, Hoy. Sisymbrium Officinale Hoy. Draba Incana Hoy Hill; Fitty Hill, Westray. Silene Acaulis Hoy Hill; Fitty Hill, Westray. Spergularia Marginata The Ayre, Walls; Vaval, Westray. Geranium Robertianum Carness, St Ola. Fragaria Vesca Rousay. Rubus Fissus Hoy. Dryas Ocopetala Hoy Hill; Kame of Hoy. Rosa Glauca, _var._ crepiniana Stromness. Circæa Alpina Hoy, Orphir, Evie. Sedum Acre Links, Hoxa, S. Ronaldshay. Saxifraga Oppositifolia Hoy Hills. Saxifraga Stellaris Rackwick, Hoy; Kame of Hoy. Pimpinella Saxifraga St Ola. Sium Erectum Holm, Sanday. Hedera Helix Berriedale, Hoy; Berstane, St Ola. Cornus Suecica Kame of Hoy. Gallium Mollugo, _var._ Bakeri Deerness, Westray. Hieracium Orcadense Cliffs in Hoy. Hieracium Scoticum Cliffs in Orphir. Hieracium Strictum Pegal Bay, Walls. Hieracium Auratum Cliffs, Pegal Bay, etc. Lobellia Dortmanna Walls, Rousay. Jasione Montana Eday, N. Ronaldshay. Arctostophylos Uva-Ursi Hills, Hoy and Walls. Pyrola Rotundifolia Hoy, Rousay. Vaccinium Vitis-Idæa Walls, Hoy, Orphir, Rousay. Vaccinium Uliginosum Walls, Hoy, Birsay. Gentiana Baltica North Ronaldshay, Birsay. Ajuga Pyramidalis Berriedale and Rackwick, Hoy. Myosotis Palustris Orphir, St Andrews. Oxyria Reniformis Hoy. Myrica Gale Birsay. Salix Nigricans Orphir. Juniperus Nana Hoy. Typha Latifolia Loch of Aikerness, Evie. Sparganium Affine Mainland, Hoy, Rousay. Ruppia Spiralis Loch of Stenness. Ruppia Rostellata, _var._ Nana Oyce of Firth. Goodyera Repens Stromness, Harray. Scirpus Tabernæmontani St Ola, Holm. Blysmus Rufus Orphir, St Andrews, Westray. Carex Muricata Firth.