22 PICTURE OF ORGANIZED NATURE. 



of the grasses may be considered as that of these 

 plants. According to Cranz, Equisetum arvense is 

 the only one met with in Greenland. 



10. The Palm Ferns in the Torrid Zone, of which 

 only two species, Zamia and Cycas, are as yet known, 

 bear a resemblance to the Equisetaceae in the Tem- 

 perate Zones, in the rudiments of their blossom. 

 Their native country is that of the arboreous ferns. 



11. Of plants without seed-leaves, the Naiades 

 come nearest to the Monocotyledones. The genera of 

 the Duck-Meat (Lemnd), the Horn-Wort (Ceratophyl- 

 lum), the Milfoil (Myriophyllum), and the Chara, are 

 common inhabitants of fresh water in the Temperate 

 Zone. Of the Acotyledones, these only bear some, but 

 very few, rudiments of flowers. According to their 

 character, as being water-plants, and what observa- 

 tion of their extension furnishes, the Temperate Zone 

 must be regarded as their native country. 



OF THE MONOCOTYLEDONES. 



1. Of all Monocotyledones, and even of all flowering 

 plants, the grasses extend nearest to the snow-line. 

 Grassy plains are found, however, in the Torrid, Tem- 

 perate, and Frigid Zones, on this side of the region 

 in which lichens prevail. Commencing in that re- 

 gion where they characterize the vegetable world, 

 they extend themselves in one way to the greatest 



