Vill INTRODUCTION. 
whether the seed is mono: or dicotyledonous. Having by this rit see 8 Seley a 
' i 1 with our investigation. 
ivision of the system a plant belongs we procee: : 
Nes Saneeanae and that we still follow DeCandolle as our guide. 
; i b-classes the characters of which 
ivides Dicotyledonous or Exogenous plants into 4 su vara f whi 
are ken outs frnetification. These four are respectively named Thalamiflore, Calicifiorae 
Corolliflorae and Monochlamydeae. 
} istingui i istinct petals and stamens inserted on 
halamiflorae are distinguished by having several distinct p 
the Thecus or setter of the flower, and not cohering with the calyx.—(flowers hypogynous.) 
i here as for example in Malvaceae so as 
The petals and stamens do however occasionally co 
in some fern to resemble those of the third class Corolliflorae, from which however in all such 
cases their numerous nearly distinct, carpels distinguish them. 
Calyciflorae have also several petals, either distinct or united to each other, but inserted 
along with the stamens on the calyx, usually through the medium of a disk lining its tube or 
concave portion.—(flowers pyrigynous or epigynous). 
III. Corolliflorae have the petals united into one bearing the stamens and inserted on the 
thalamus, or receptacle (hypogynous). 
IV. Monochlamydeae have either no corolla or the petals if present are united to the 
calyx forming together a single, not double, perigonium or verticel of flower leaves round the 
pistil. 
formed and closely surrounded provinces, 
All therefore that can be looked for is well 
s, the boundaries of which should be as 
have obtained such general favour as the one the ground work of which I have sketched, even 
hough liable to such striking defects as those I have indicated. But to proceed. 
L Taatamrrtor2.—This sub-class includes all the plants originably referred by Jussieu to 
his 13th class (Polypetale hypogena) those namely with hypogynous or inferior flowers, a 
several petals or which has more recently received the name of Hypopetale: that is petals 
Inferior to the pistil or ovary. This is a large class, presenting many anomalies, but upon the 
whole, generally of sufficiently easy application in practice. 
weed Catycirtorx.—This sub-class is more. difficult, and often not easily distinguished 
from either the preceding or the succeeding one. It is divided into six sections. 
