BOTANICAL GEOGRAPHY. 431 



independently of these, and although subject to known 

 criticisms in a systematic point of view, is indispensable to 

 the understanding of the author's larger work on the Algae. 

 Local Floras of Germany: F. Wimmer, Flora of Silesia. 

 Concluding volume (Breslau, 1845, 12mo); J. C. Metsch, 

 Flora Hennebergica, a contribution to the Flora of the 

 Prussian portion of the Forest of Thuringia (Schleusing, 

 1845, 8vo); F. Schultz, Flora of Palatinate (Speier, 1846, 

 8vo) ; it appeared, however, in 1845. 



In Metsch's memoir upon the plants of the mouth of 

 the Swine (Ratisbon Flora, 1845, pp. 705-8) is contained 

 a sketch of the vegetable formations on the island of 

 Usedom. 



The sandy soil is in some places extended into plains, at others depressed, 

 so as to receive deposits of peat or salt-water lakes ; sometimes it forms ele- 

 vations, which are partly covered with the pines, or even considerable forests 

 of beech. The dunes along the coast are consolidated by roots of Gluma- 

 cese or Salix. A few of the characteristic plants only can be mentioned 

 here, as the author only enumerates the more rare species : 



1. Formation of plants on the dunes, e. g. Ammophila arenaria and Bal- 

 tica, Mymus arenarim, Carex arenaria, Kochia hirsuta, Halimus portulacoides, 

 Petasites spurim, and Anthyllis maritima. 



2. Formation of the sea plants, e. g. Aster salignus, Erythrtea linariifolia, 

 Zannichellia pedicellata, Juncus balticus, Scirpus Rothii, and Hierochloa 

 borealis. 



3. Formation of the marsh plants, e. g. Thalictrum aquilegifolium, Barbarea 

 stricta, Helosciadium inundatum, Lysimachia thyrsiflora, Euphorbia palustris, 

 Salix daphnoides and rosmarinifolia, Stratiotes, Carex filiformis, and Calama- 

 grostis stricta. 



4. Formation of the peat plants, e. g. Ledum palmtre, Betula fruticosa, 

 Empetrum, and Myosotis sparsiflora. 



5. Formation of herbaceous plants on sunny hills, e. g. Thalictrum minus 

 and simplex, Silene viscosa, and Ononis hircina. 



6. Formation of the forests, e. g. Arabis arenosa, Vicia villosa, Peuceda- 

 num Oreoselimim, Arctostaphylos officinalis, Pyrola chlorantha, media, and 

 umbellata, and Goody era repens. 



V. Mohl has written a memoir on the Flora of Wur- 

 temberg (Wiirtemb. naturwissenschaftliche Jahreshefte. 

 Jahrg. i, pp. 69-109. Stutt., 1845, 8vo). 



He commences with general remarks on the scientific importance of local 



