BOTANICAL GEOGRAPHY. 451 



Scrophulariaceae (26), Cistineae (21), and Boraginese (20). Cryptogam ic 

 plants are very rare, because the dryness does not suit the Mosses, nor the 

 limestone the Lichens. According to its geographical distribution, the flora 

 of the first region resolves itself into the constituents : a. About 200 are 

 endemic to Spain, or consist of species distributed as far as Barbary or 

 Provence ; 12 species only are also found in the East. Characteristic families : 

 12 Cruciferse (half of which are Brassicacese), 20 LeguminosEe (13 of which 

 are Genistese)* 24 Synantheracese (11 consisting of Cynaracese), 12 Scro- 

 phulariaceae (8 Linarite], and 13 Labiatse. b. About 770 Mediterranean 

 plants, the distribution of which is more extensive, but confined to the 

 Mediterranean Sea. c. 200 Central European plants, most of which are 

 either ruderal or marsh plants. Boissier observed 698 species in the second 

 region, of which one seventh ascend into the third region, and some still higher. 

 They consist of 202 0, 465 %, and 31 0. To the 1 belong 21 trees, 

 43 tall and 68 low shrubs : of the tall shrubs, 11 consist of Leguminossc 

 (10 Genistese), 4 Cistinese, 4 Caprifoliaceae, and 4 Rosacese ; of the under- 

 shrubs of the Tomillares, 13 consist of Labiatae (4 species of Tkymus), 12 

 Synantheracese (5 species of Santolina), 7 Cistinese, 7 Leguminosae (Genistese 

 and Astragalus tumidus), 4 Ericaceae, 4 Chenopodiaceae, and 3 Thymeleaceae. 

 The region contains 597 Dicotyledons, 93 Monocotyledons, and 8 Ferns, dis- 

 tributed through 65 families, the following of which contain most species : 

 Synantheracese (97), Leguminosae (50), Labiatae (44), Cruciferse (41), Um- 

 belliferae (40), Graminacese (36), Scrophulariacese (27), and Cistineae (23). 

 Cryptogamic plants are common, tree-lichens commence at 3300' in the 

 Serrania de Ronda. The second region contains the following components, 

 arranged according to their geographic distribution : a. 220 Spanish plants, 

 of which 22 are distributed as far as Provence; 9 species are also 

 found in the East. Characteristic families : 15 Cruciferse, 15 Leguminosse 

 (11 Genistese), 15 Umbelliferae, 33 Synantheraceae (19 Cynaracese), 1 5 Scro- 

 phulariacese, and 1 7 Labiatse. b. About 220 Mediterranean plants. Boissier 

 collected 422 species in the third region: of these 333 are Tt, 78 , and 

 11 . To the 1^, belong 14 trees, 44 mostly low shrubs : among these 

 9 Labiatae (Thymus 5 species), 8 Leguminosae (6 Genistese, 2 Astragaleae), 

 5 Rosacese, and 4 Thymeleacese. The region contains 358 Dicotyledons, 

 54 Monocotyledons, and 10 Ferns, distributed through 52 families, among 

 which the following contain most species : Synantheracese (55), Legurninosas 

 (29), Graminacese (29), Cruciferse (29), Caryophyllacese (29), Labiatas (27), 

 Scrophulariaceae (24), and Umbelliferse (20). Arranged according to their 

 geographical distribution, the third region contains : a. 182 Spanish plants, 

 of which 101 species appear at present to be confined to Granada. Cha- 

 racteristic families : 12 Cruciferae, 14 Caryophyllaceae, 15 Leguminosse, 21 

 Synantheraceae, 12 Scrophulariacese, and 16 Labiatse. b. 185 Central Euro- 

 pean plants, c. 55 Mediterranean plants. In the fourth region, Boissier 



