80 



PLANT STUDIES 



Fig. 73. A flower of the tobacco plant : o, 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 ; 6, acorolla 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 

 Strase-urger. 



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 e 



Fig. 74, A group of flower forms : a, a flower of harebell, showing a bell-shaped 

 corolla composed of five petals ; 6, a flow-er 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 ; rf, 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. 



