38 THE FLOWER. 
5th. Absence. The four remaining classes depend upon the 
absence of the stamens in a part or all of the flowers of the same 
species. 
XXI, Monacta (moves, ovos, an abode), includes plants 
where the stamens and pistils are in separate flow- 
ers, on the same individual. 
XXII, Dia@cia (61s, ovxog), in separate flowers on different 
individuals. 
XXIII, Potyeamia (zodvs, many, yeuos, marriage), where the 
\ stamens and pistils are separate in some flowers, 
and united in others, either on the same or two or 
three different plants. . 
XXIV, Cryprocamia (*gumtos, concealed, yauos), includes 
those genera of plants where the stamens and pis- 
tils are wanting, or at least invisible, commonly 
called FLowErR.ess Piants. (46—49.) 
a. Such are the twenty-four Linnean classes, in which all the genera of the vege- 
table kingdom are included. Nothing could have been more simple than the first 
eleven. To distinguish them, we have only to count the stamens. The other 
classes are founded upon distinctions less simple, though in general easy to be 
understood. A good specimen flower of each class should here be closely exam- 
ined, to illustrate the definitions, and fix them in the memory. 
The following simple figures are emblematic of each class, to which the pupil 
is required to apply the appropriate numbers and names. 
FIG. 9. — Stamens. 
