80 



PLANT STUDIES 



Fig. 73. A flower of the tobacco plant : a, a complete flower, sliowing the calyx with 

 its sepalB blended below, the funnelform corolla made np of united petals, and the 

 stamens just showing at the mouth of the corolla tube ; i, a corolla tube split (tpen 

 aud 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 Btigma.— After 

 Stkasburger. 



last sot of liorul leaves (carpels) appear, tlio growth of the 

 stem ill leiii^th is elieckecl and tlie eluster of lloral leaves 



i. 71. A group of flower forms: a, a flower of harebell, showing a bell-sliaped 

 conjlla composed of five petals ; b, a rt(j\\er of phlox, showing a tubular corolla 

 witli its five petals distinct above and sharply spreading ; c, a flower of dead-nettle, 

 allowing an irregular corolla with its five petals forming two lips above the funnel- 

 form base ; (/, a flower of toad-flax, showing a two-lipped corolla, and also a spur 

 formed by the base of the corolla ; f, a flower of the snapdragon, ehowiDg the two 

 lips of the corolla closed. —After Gray. 



