128 LINNjEAN ARTIFICIAL SYSTEM. 



27. Trigynia: Embracing such plants of the class, 

 as produce flowers with three pistils. 



In this order, stands the poisonous genus sumach or poison-oak. 

 The heautiful laurestinus, which renders itself so valuable by bloom- 

 ing through most of the winter, is likewise of this order, as also the 

 > elder, gelder-rose, French tamarisk and common chick-weed. 



28. Tetragynia : Formed by such plants of the class, 

 as produce flowers with four pistils. 



This order contains only two families of plants; the elegant and 

 curious genus called parnassia or grass of Parnassus, and the genus 

 evolvulus, nearly allied to convolvulus. 



29. Pentngynia: Including such plants of the fifth 

 class, as produce flowers with^re pistils. 



Of the plants of this order, the common thrift, sea-lavender, com- 

 mon flax, and the genus drosera or sun-dew, will afford very excel- 

 lent illustrations. 



30. Polygynia: Consisting of such plants of the 

 class, as produce flowers with many pistils. 



The lesser mouse-tail or myosnrus minimus of this country, and 

 the parsley-leaved yellow-root of North America, are the only spe- 

 cimens to be collected of this order. 



CLASS VI. HEXA"T)RIA. 

 ie 



31. Clutracter: The plants of this class, have flowers 

 with six stamens, all of one uniform length, or at least, 

 nearly so, in which respect they differ from plants of 

 the class tetradynamia. None of the flowers of the class 

 hexandria have four petals, as is the case with all those 

 of the fifteenth class. (F. 179.) 



