80 
PLANT STUDIES 
FIG. 73. A flower of the tobacco plant : a, a complete flower, showing the calyx with 
its sepals blended below, the funnelform corolla made up of united petals, and the 
stamens just showing at the mouth of the corolla tube ; &, a corolla tube split open 
and showing the five stamens attached to it near the base ; c, a pistil made up of 
two blended carpels, the bulbous base (containing the ovules) being the ovary, the 
long stalk-like portion the style, and the knob at the top the stigma. After 
STRASBURGER. 
last set of floral leaves (carpels) appear, the growth of the 
stem in length is checked and the cluster of floral leaves 
a b c d 
FIG. 74. A group of flower forms : a, a flower of harebell, showing a bell-shaped 
corolla composed of five petals ; 6, a flower of phlox, showing a tubular corolla 
with its five petals distinct above and sharply spreading ; c, a flower of dead-nettle, 
showing an irregular corolla with its five petals forming two lips above the funnel- 
form base ; c?, a flower of toad-flax, showing a two-lipped corolla, and also a spur 
formed by the base of the corolla ; e, a flower of the snapdragon, showing the two 
lips of the corolla closed. After GRAY. 
