MONOCOTYLEDONS 89 
Leaves spreading, but appearing nearly as though in 2 rows on opposite 
sides of the stem. Dark green above, light bluish-green below. Through- 
out our area. 
SUB-DIVISION II—ANGIOSPERMAE 
The ovules in this great division are concealed in a cavity known 
as the ovary. (Fig. 1, below.) 
The flower consists essentially of a pistil, at the base of which 
is the ovary containing the ovules and one or two or more stamens 
bearing anthers on which are developed the pollen grains destined 
to fertilize the ovules. The pistil and stamens may occupy dif- 
ferent flowers. Flower receptacles bearing these two essential ele- 
ments separately may grow upon the same plant, in which case 
they are said to be monoecious, or the pistillate flowers may oc- 
cupy one plant the staminate another, in which case they are said 
to be dioecious. 
When the pistils and stamens are found on the same receptacle 
the flower is said to be a perfect flower and this is the form pre- 
vailing in the great majority of plants of this great division. 
Plants of this sub-division are divided into two classes. 
1, showing the numerous cotyledons of pine. 2, a grain of wheat showing 
the position of the embryo at the base. 3, a grain showing the development 
of the young plant. 4, the two cotyledons of a garden bean with the embryo 
between them. 5, a leaf oi grass, showing the parallel veins of the mono- 
cotyledons, 6, a leaf of Asarum, showing the net veins of the dicotyledons. 
Class I—MONOCOTYLEDONOUS PLANTS 
Plants with Single-Lobed Ovules 
The embryo has a single seed lobe (cotyledon) (Figs. 2 and 3, 
above). Leaves generally parallel-veined (or nerved) (Fig. 5), 
enfolding one another at the base (sheathing). Rarely the leaves 
are net-veined. 
