. The continental element in the flora of south Sweden. Botany -- Sweden. 230 RIKARD STERNER Tabic I. A comparison between the floras in certain. Kazan Moscow Livonia West Prussia Silesia Brandenburg South Sweden Westphalia Northern France South-Eastern England Total number Number of s[iecies of species in Kazan Moscow Livonia West Prussia the special districts Total number % Total number ! Total I '^ number ^° Total number % 774 685 89 612 79 653 84 86i 685 cSo 6S9 80 746 87 846 612 72 689 81 782 92 1,036 653 63 746 72 782 75 1,104 620 56 730 66 760 69 946 86 ',059 631 60 715 68 765 72 945 89
. The continental element in the flora of south Sweden. Botany -- Sweden. 230 RIKARD STERNER Tabic I. A comparison between the floras in certain. Kazan Moscow Livonia West Prussia Silesia Brandenburg South Sweden Westphalia Northern France South-Eastern England Total number Number of s[iecies of species in Kazan Moscow Livonia West Prussia the special districts Total number % Total number ! Total I '^ number ^° Total number % 774 685 89 612 79 653 84 86i 685 cSo 6S9 80 746 87 846 612 72 689 81 782 92 1,036 653 63 746 72 782 75 1,104 620 56 730 66 760 69 946 86 ',059 631 60 715 68 765 72 945 89 940 580 62 620 66 777 83 845 90 934 550 59 610 65 662 71 805 86 1,103 5'5 47 605 55 647 59 778 71 975 490 50 545 56 629 65 744 76 and the uplands of Middle Germany, the Carpathians, and the South Russian steppe district in the south. The flora region, thus delimited, may seem rather heterogeneous; several im- portant forest trees, for instance, reach their boundaries within these regions, such as beech, Scotch pine, spruce, hornbeam, Ulmus foliacea Gilib., Acer pla- tanoides etc. In order further to examine the degree of homogeneity of the flora, and to find out to what extent possible lack of uniformity is to be traced back to the heterogeneous distribution of continental species, a comparison will be made between the floras of certain special districts in difi"erent parts of the region. The special districts examined and the taxonomic works used in the examina- tion are as follows: 1. The government of Kazan: Korshinsky 1898. 2. The government of Moscow: Herder 1892, Petunnikov 1896—1901. 3. Livonia (with Polish Livonia): Lehmann 1895 and 1897. 4. West Prussia: Ascherson und Graebner 1898—1899. 5. Silesia: Fiek 1881. 6. Brandenburg: Ascherson und Graebner 1898—1899. 7. South Sweden: Lindman 1918. 8. Westphalia: Beckhaus 1893. 9. Northern France (the departments of Somme, Pas de Calais, Nord, Ardennes, and Aisne): Aclo(iue 1903. 10. South-Eastern England (bounded
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