162 Rhodora [OCTOBER 
nodes; as contrasted with this he describes Eupatorium purpureum 
as having lanceolate-ovate leaves in 4's and says the leaves are un- 
equally serrate and rugose. Unfortunately he transferred the wrong 
citations. The first two of those kept by him under Eupatorium 
purpureum answer his description of E. maculatum, while none of 
the citations transferred by him to E. maculatum answer his des- 
cription of that species, but all answer his description of Eupatorium 
purpureum. These citations have already been discussed at length 
above, and it is undoubtedly on the basis of the disposal by Lin- 
naeus of these citations that the name Eupatorium maculatum has 
come into use for Species No. 1 of this paper. 
It would therefore seem plain that in making this transfer Lin- 
naeus got things mixed. Certain it is that his description of Eupa- 
torium maculatum more nearly accords with the descriptions of 
previous authors left by him under Eupatorium purpureum than it 
does with the descriptions from previous authors cited by him under 
Eupatorium maculatum. Under these circumstances, I would fol- 
low Prof. Wiegand and be governed by the description of Linnaeus 
rather than his citations. 
But this being done we have to solve the even more troublesome 
problem of what Linnaeus was describing. Prof. Wiegand applies 
his description to Species No. 2, based on a photograph of a specimen 
collected by Kalm from the herbarium of Linnaeus. He says this 
“shows six leaves in the whorls (though unusual even for this species) 
and in every way answers the description of E. maculatum given by 
Linnaeus. " 
It seems very doubtful to me whether Linnaeus was describing 
this plant at all. It seems to me that what he was attempting to do 
was to eliminate from Eupatorium purpureum everything which 
had more than four leaves in a whorl and which were equally serrate. 
At least this is what he says. I find nothing in his description which 
would lead one to believe that it is based on some particular speci- 
men. The description is too general for that. 
'The plant which his description answers the best is Species No. 3 
—a plant which always has lanceolate leaves equally serrate in 5's 
or 6's and also has stems very slenderly spotted. "Therefore I am 
applying the name to Species No. 3—the plant so well described by 
Barratt under the name Eupatorium fistulosum. 
