CHIP. III.] HYDROCHARIDE^. 435 



CHAPTER III. 



PHANEROGAMOUS PLANTS. MONOCOTYLEDONT.i. 



All the trees belonging to this division are 

 natives of tropical countries ; and they, as well 

 as all the herbaceous plants belonging to it, are 

 distinguished by the veins of their leaves being 

 never branched, but principally in parallel lines. 

 These plants are re-divided into those with a 

 perianth, which are called the Petaloidese, and 

 in which are included the Orchidacese and the 

 bulbous-rooted plants ; and those without a 

 perianth, which are called Glumacea?, and in 

 which are included the grasses, and sedges. 



I.— PETALOIDE.^. 



ORDER CLXXIX.— HYDROCHARIDE^.— THE FROG'S 

 BIT TRIBE. 



Aquatic plants, two of which are of very 

 curious construction. In Vallisneria, the male 

 and female flowers are on different plants, and 

 the buds of the female flowers rise on Ions: 

 spiral stalks, which gradually uncoil, till the 

 flower appears above the surface of the water, 



F F 2 



