Pagina-afbeeldingen
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56. Compositæ. .

57. Lobeliaceae..

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58. Campanulaceæ 8 3 46 3 3 4 2 2 2 2 4

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60. Primulaceæ. . . 21 31 92 2 4 6 4 4

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(1) Le Glinus loloides reproduit celui de la Fam. 14, Mollugineæ.

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Si on recherche ce qui se passe de la zone la plus inférieure à la plus supérieure, relativement aux dix familles les plus nombreuses (en réunissant les Silénées et les Alsinées sous le nom de Caryophyllées), on voit: 1° les Composées, Graminées, Labiées, Ombellifères, Scrophularinées et Liliacées, éprouver peu de variations dans leurs proportions numériques; 2o les Papilionacées diminuer ; 3° les Caryophyllées, Crucifères et Borraginées augmenter. C'est ce que montre le tableau suivant :

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TOTAL de la flore 1417 100,0 876 100,0 523 100,0 179 100,0 138 100,0126 100,0

Sous le rapport de la durée des individus, les espèces végétales sont habituellement divisées en quatre catégories : les espèces annuelles D, bisannuelles, vivaces, et ligneuses . Celles-ci peuvent cependant être réunies en deux groupes : 1° les plantes Monocarpiennes, qui ne fructifient qu'une fois, annuelles ou bisannuelles; 2° les plantes Polycarpiennes, qui fructifient un nombre de fois plus ou moins grand, et dont la vie se conserve soit dans la racine et la base de la tige, plantes vivaces, soit dans la racine et la tige entière, plantes ligneuses.

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Ligneuses h .... 124 14,1124 23,7 50 27,9 22 15,9 49 45,4 = et h...... 391 44,6 338 64,5 149 66,5 94 68,1 98 77,8 +

TOTAL des espèces. 876 100,0 525 100,0 179 400,0 138 100,0 126 100,0

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