NATURAL FAMILIES. 



189 



gilly-flower belong to this family. They are found, on a 

 chemical analysis, to contain some sulphur. 

 Fig. 99. 



B 



Fig. 99, A, represents a flower of the cruciform family ; at 

 B, a, may be seen the stamens arranged in two sets, four being 

 longer than the two at b ; at c, are two glands between the 

 short stamens and the germ ; at C, is a petal, consisting of a, 

 the border, and 3, the claw ; at Z>, is the pod or silicle ; a repre- 

 sents the valves, 3, the seeds as alternately attached to the 

 edges of the partition or dissepiment which divides this kind of 

 pericarp into two cells. 



CLASS 14. 



Corolla polypetalousj stamens perigynous (around the germ). 



In this class we find the family rosacece, having rosaceous 

 corollas ; a calyx mostly urn-form ; petals usually 5, inserted 

 into the top of the calyx ; stamens indefinite, generally over 

 10. The structure of the fruit varies in the apple (Pyrus ma- 

 ins), the fruit is below the top of the calyx and contains many 

 cells ; embryo without albumen. The pericarp of the apple 

 is classed by Mirbel in the order Bacca or berry, and the genus 

 Pyridion. The rose belongs to the same natural family as the 

 apple, and gives name to the whole group described under the 

 name Rosaceous. 



Examine an apple blossom and a wild rose, and you will 

 perceive the former to be a miniature representation of the lat- 

 ter ; their fruits, too, which at first thought might seem to-you 



Explain Fig., 99 Characters of Class 14 Describe the rosacese Compar- 

 ison between the apple and rose. 



