: _ from each other are in two sets, two classes (14th and 15th) 
188 _ LINNAAN SYSTEM. 
3. Triecia. In this order the dif- 
ferent kinds of flowers are placed on ‘ : . 
3 different plants, as in the mri oe ae 
On) Se ee ea nee 
664. In the 24th class, Cryptogamia, the orders have 
been somewhat modified since the time of Linnzus: see the 
table, page 191. 
665. It will be seen, from the foregoing account of the 
Linnean System, that the leading divisions, the classes, are 
themselves arranged in sets, determined by a variety of cha- 
racters. 
666. First, there are two great divisions, FLowERING 
Pays (with stamens and pistils), and FLowERLESS Punts 
without stamens and pistils, The first 23 classes include the 
Flowering plants, the 24th the Flowerless. : 
667. The twenty-three classes of Flowering plants are di- 
vided into two sets,—three classes (21st, 22d, and 23d) which 
have the stamens and pistils separate from each other and 
twenty classes (1st to 20th) in which the stamens and pistils 
are together. 
668. These twenty classes are also in two sets,—one class 
(the 20th) having the anther and style united, while in the 
other nineteen classes these organs are separate. - i 
669. These nineteen classes are in two sets,—four classes, — 4 
(16th, 17th, 18th, 19th) in which the stamens are united to 
each other, and fifteen classes (1st to 15th) in which they 
are separate. j 
670. The four classes in which the stamens are united are 
in two divisions,—one class (19th) in which the stamens as 
joined by the anthers, the filaments being free, and three 
classes (16th, 17th, 18th) in which the stamens are joined by 
the filaments, the anthers being free. 
671. The fifteen classes in which the stamens are separate 
____ in which the stamens are of unequal length in each flower ; 
and thirteen classes in which the stamens in each flower are 
_ equal in length, or, at least, there is no very marked differ- 
_ ence. 
