172 Dr. W. Seller on some Plants obtained 
Of the S. oppositifolia I have nothing to observe. The speci- 
mens of S. ¢ricuspidata are several and very well marked. Of the 
S. cernua the specimens are pretty numerous, while very few, as 
is usual, have flowers. One has a rather large flower with two 
unblown flowers near it, so as to form an approach to a simple 
umbel. In another there is a well-blown flower and an unblown 
small flower near it. The only specimen besides, which has a_ 
flower at all, is one-flowered. Sir Wm. Hooker in the ‘ British 
Flora’ remarks on this species, “frequently there is no flower, 
and [ have never seen more than one upon a stem.” Linnzeus 
also describes the S. cernua as one-flowered, Wahlenberg how- 
ever says, ‘ caule subunifloro,” and Sir Wm. Hooker in his ‘ Flora 
Boreali-Americana’ has in the definition “ flore seepe subunifloro.”’ 
In these specimens the minute rounded bodies or bulbils which 
stand instead of flowers are easily extracted from the axils of the 
uppermost leaves. And in all the specimens the root is clothed 
with amylaceous scales, giving to it at the first inspection no small 
resemblance to the root of the 8. granulata. In none of the de- 
scriptions that I have consulted is this singularity of the root 
referred to except by Mr. Don, who speaks of the “ radix squa- 
mata, squame e basibus petiolorum foliorum primordialium 
enata.” And moreover he places this species in his third section 
of the genus Savifraga, termed Leiogyne, of which he remarks, 
that “the roots, whether scaly or fibrous, scarcely afford any spe- 
cific character, as they have all a tendency to become scaly.” 
Our fourth Saxifrage is the S. rivularis. It is wholly im fruit, 
and is taller and stouter than usual. Wahlenberg says the S. r7- 
vularis hardly exceeds an inch in height. Hooker describes it 
as “pigmea.” Don gives two inches as the height of the stems. 
Our specimens approach to three inches. There can be no doubt 
however that these are specimens of the S, rivularis. 
Composir#.—Of the plants before us, one only belongs to 
the Composite. On mentioning at our last meeting that | took 
this syngenesious plant for a species of Arnica, my opinion met 
with very little countenance. I have since examined the speci- 
mens with some care, and I feel satisfied that the plant is an 
Arnica, and that it is the same as what authors have described as 
one of the Arctic forms of the Arnica montana. 
As however this Arctic plant differs so much in aspect from 
the luxuriant plant of more temperate countries, it may be worth 
while to give the results of that examimation. Our specimens 
have no root-leaves, and Mr. Sutherland assured me that he saw 
none when he gathered them. On this however I shall not insist. 
The scape is five or six inches long, hollow, one-flowered. Be- 
tween one and-two inches above the base two opposite leaves or 
leafy scales arise, in some degree amplexicaul, or even approach- 
