LINNZAN SYSTEM, 189 
672. These thirteen classes are in two sets—eleven classes — 
(ist to 11th) in which the number of the stamens in each 
flower is less than twenty, and two classes (12th and 13th) in 
which the number of stamens in each flower is more than 
twenty. 
673. In these two classes the situation of the stamens is 
taken into account in determining the class; the stamens 
being placed upon the calyx in the 12th class, upon the re- 
ceptacle (under the ovary) in the 13th class. 
674. The first eleven classes are distinguished from each 
other solely by the number of the stamens. 
675. Thus, in determining the Linnean class of a plant, the 
student examines it to see, first, if it have or have not stamens 
and pistils; if it have these organs, he, secondly, looks if the 
stamens and pistils are in the same flower, or separate ; if they 
are together, he, thirdly, looks if the stamens and pistil are free 
or united to each other ; if free, he looks, in the fourth place, 
if the stamens are united to each other or separate ; and so 
on, as will be understood from the arrangement of the class- 
és in brackets in the following tabular view of the Linngwan 
System. 
