ee Se ee ee ee ee ee ae a ee ee ee rer 
ee eee 
Se ee OS Dey Wire thal wn SOU ie Ce oR 
| 4 Place, this should stand as the type of a genus 
_ Which must embrace all our present species of Nas 
. first on the page in Adanson’s Famiilles. That is priority, 
- fact that Dumortier named some species under Budah as, 
do with the case. 
_ Many other important genera o 
_ interpreted by the reformers with similar disregard of their own 
1898] THE ROCHESTER NOMENCLATURE 44 
a synonym, ’, for instance, states that a name once applied in one 
sense may not be used subsequently in any other, and this 
directly affects the case in hand; for to return to the example 
of Erysimum, the first species of this genus was a Sisymbrium, 
In other words Erysimum was first employed to designate what 
we now call Sisymbrium. As we read down the 660th page of the 
Species Plantarum and arrive at the last line in the description of 
E. officinale, we have reached a point where the genus Erysimum 
has already been published. The needful generic name has 
been coupled with a definitely characterized and well-known 
‘species. If it is not a published genus when we have reached 
this point, why is any monotypic genus in the Species Plantarum 
to be so regarded? But Erysimum, thus established by the 
publication of its first species, applies only to what we now call 
Sisymbrium, and any transfer of the generic name to another 
genus, is not only opposed to ‘‘priority of place” but contrary — 
to the principle of ‘once a synonym always a synonym,” which 
expressly forbids such a change in the use ofaname. The fact 
that Linnzeus himself, further down the same page, published 
certain other species, which he considered congeneric, or that 
Erysimum was by later authors differently applied, should have 
to the mind of the consistent advocate of priority no weight 
whatever. In this connection I recall the words of Professor 
- Britton 
son that it stands 
Iam sure, The 
to me, nothing to 
I accepted Tissa rather than Buda for the simple rea 
In the Species Plantarum, as I have above implied, there are 
f like composite character, and 
Principles. Thus the first Sisymbrium was a Nasturtium, and for 
those who would follow consistently the principle of priority of 
Sisymbrium , 
turtium, and 
* Jour, of Bot. 19: 265. 
