BOTANICAL APHORISMS, - i7] 
corolla; but we could not in description give se 
proper an idea of the figure of plants. It is there- 
fore better to distinguish these organs, and in doubt- 
ful cases to substitute something else. According 
to Linnaeus, when there is but one part present, and 
the stamina stand opposite to the laciniz, that part 
is considered as calyx: but when they stand alter- 
nately with the laciniz, it is said to be a corolla. 
‘here are however calyxes to be found where the 
stamina stand alternately with the laciniz: ; and plants 
that have a greater number of stamina than of laci- 
nie or foliola of the calyx ; it is therefore by this rule 
impossible to say whether the part be a calyx or co- 
volla. Scopoxi1 thinks that when only one part is 
present, it should be considered as a calyx. ‘This 
rule errs against all analogy. There are genera 
which have but one part; and suppose a species te 
be discovered with two, the case might happen that 
what was called calyx was really corolla. It is 
best, therefore, to call that part calyx which is 
nearly of equal length with the stamina, and is of a 
green and firm substance. ‘These three circum- 
stances must appear when we call the part a calyx. 
What should be called corolla which is longer or as 
long as the stamina, is coloured, and of a tender 
substance. Particular exceptions are not to be re- 
ewarded. ‘These three characters must always COll- 
cur. For instance, the flowers of ‘Vhesium /inophy/- 
lum have but one cover, which is somewhat longer 
than the stamina, of a firm substance, green, but 
white on the inner surface. ‘This cover must be 
called calyx, because it is green.on the outside, and 
ob 
