168 ——s- PRINCIPLES OF BOTANY, &c. 
§ 153. 
Our botanical knowledge would be very limited 
if nature confined herself to the natural structure, 
and had made all flowers and fruits according to one 
form. But the contrary is the case, and we are 
therefore enabled to acquire a more extensive ac- 
quaintance with the vegetable kingdom. ‘Of this 
the Terminology will serye as a proof; it points out 
to us the deviations of plants from the natural struc- 
ture ; and these deviations, when we consider merely 
the Hower and fruit, exhibit the varied structure, 
(structura differens), of plants. / The structure 15 
the foundation of every genus; all genera and theit 
characters Soper on this sti ructiire ue fie natural 
ONee aa, Bh wana ee 
§ 154, 
The particular structure, (structura singularis), 18 
that which is directly opposite to the natural one, 
and affords the most beautiful characters. When} 
for example, in a monopetalous corolla the stamina 
stand upon the receptacle instead of being, inserted 
in the corolla, we call that a singular structure; or 
when the nectaria stand between ‘the corolla and the 
calyx, as in Wildenowia, instead of ‘standing, as is 
usual, between the corolla and the stamina. 
Some other examples are delineated on the fifth 
plate, which I shall here more particularly mention : 
- The genus Cucullaria, fig. 112, 113, shews an 
orchideous flower, wath the anthera inserted i into a 
peta Wate OAR TRUSSO a eh NGM | 
9 “The 
