Herbarium material does not, indeed, allow one to extrapolate safely: what you see is what you get; what you get is classical alpha-taxonomy which is, very largely and for sound reasons, in disrepute today.

It will be observed, that in this system it is only necessary to remember the metre, are, litre, and stere, all the others having certain relations to these, being equal to them taken 10, 100, 1000, &c. times, […]

Now am I hail-fellow-well-met with all; Now every man gives me good-morrow;....

What therefore God hath ioyned together, let not man put asunder.