

LABORATORY PRACTICE CHAP, xvm 



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CHAPTER XVIII 



A TYPICAL OR PATTERN FLOWER 



I. Take a flower of some species of Crassula and 

 notice : 



1. Its size, shape, color, etc. 



2. Its structure : 



(a) A circle of green, leaf-like pieces on the very 

 outside. These are called sepals and the 

 circle of sepals is called a calyx. 



() How many sepals are there ? 



(*) Are they all alike ? 



(</) Next to these a circle of colored parts, the co- 

 rolla, composed of petals. How many petals 

 are there? Are they all alike ? 



(e) Following the petals, a circle of stamens. How 

 many are there ? Are they all alike ? 



(/) Each stamen is made up of two parts, the stalk 

 or filament below and the anther or sack con- 

 taining the yellow dust (polleii) above. 



(g) The innermost circle of green bodies, the pistils, 

 each of which is composed of three parts : 

 the lower swollen portion, the ovary; the 

 slender portion above it, the style ; and the 

 small body at the tip, the stigma. 



(h) How many pistils are there ? Are they all alike ? 



