166 PRINCIPLES OF BOTANY, ETC. 
natural, (structura naturalissima), or varied, (di- 
ferens), or lastly, particular, (vingularis). 
§ 151. 
The structure is to be considered according to its 
number, (numerus); figure, (figura); situation, (si- 
tus); and proportion, (‘proportic): and by these we 
observe whether it is natural, varied, or particular. 
In genera we must always be attentive to number, 
figure, situation and proportion; because without 
these no genus’ can be properly ascertained. On 
these are founded all the genera and most of the 
rules which, in the sequel, I shall lay down. 
" 
6152. 
The natural structure, (structura naturalissima), 1s 
that form of the fruit and flower which is most fre- 
quent. In the natural character it is not used; for 
it serves only as a rule for the other kinds of struc- 
ture. The following is the most natural structure 
of the flower. 
The calyx is green, shorter than the corolla, and 
thicker; the corolla is tender, easily falls off, and 
is surrounded by the calyx. The stamina stand 
within the corolla, the antherz stand erect upon 
the filaments, the pistillum is in the middle of the 
flower. As to number, the calyx and corolla are 
for the most part divided into five lacinize, the sta- 
mina are five with one style. The laciniz or 
foliola of the calyx and corolla are in general 
equal in number with the stamina. ‘The fruit al- 
ba ways 
