90 . Rhodora (Мат 
of S. humilis from the complex description of Solander and Dryander, 
citing “Herb. Banks. mss." From the fact that Solander, in the 
original manuscript description of S. humilis, cited (besides the sub- 
sequently discarded Florida plant) only one plant, the Banks speci- 
men from Newfoundland, it is fairly clear that this should stand as the 
type of Pursh's species. Whether or not it proves on more critical 
examination to be S. uniligulata (which is probable) or S. uliginosa, 
it certainly is not the plant of our river-gorges and cliffs to which the 
name S. humilis has so long been applied. 
On account of a supposed earlier Solidago humilis accredited to 
Miller, which, however, was published by Miller as S. humilius and 
which is S. canadensis L., Porter rejected the name S. humilis Pursh 
and assigned to the plant which has been passing as Pursh's S. humi- 
lis the name S. Purshii? defining his species merely by the citation of 
the synonym S. humilis Pursh. The name 8. Purshii Porter is, there- 
fore, strictly synonymous with S. humilis Pursh; and since, as above 
pointed out, the plant which must stand as the type of Pursh's species 
is S. wniligulata or a related species, the names S. humilis and 8. 
Purshii are equally untenable for the plant of our northeastern river- 
banks and cliffs. A well known station for the plant specially under 
discussion is at the Great Falls of the Potomac. The plants from this 
station long have been and by most botanists still are considered 
conspecific with those from the ledges of the Aroostook, Kennebec, 
Winooski (or Onion) and Susquehanna Rivers; but by Professor 
E. L. Greene they have been separated on supposed characters of 
the inflorescence, involucre, and achenes as 8. racemosa® The 
characters upon which Professor Greene relies for the separation all 
fail when tested by comparison with more northern specimens; and 
the range assigned by him on a succeeding page (“that plant of the 
East Canadian coast and islands which is typical S. humilis, Pursh, 
now received under the more safe name of S. Purshii, Porter” *) 
suggests that his segregation of S. racemosa from the plant of our 
river-gorges and cliffs, which is known from only, a single “East 
Canadian" station * and from no coastal or island stations, was ac- 
complished without a precise understanding of the northern “8. 
1 Mill Dict. ed. viii. no. 16 (1768). 2 Porter, Bull. Torr. Bot. Cl. xxi, 311 (1894). 
3 Greene, Pittonia, iii, 160 (1897). 1 Greene, Pittonia, iii. 162 (1897). 
5'The Gorge of the Aroostook River, less than two miles from the northern Maine 
border. 
