ER eT TN Ip 
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1896] ROS4 AMERICAN 27 
(Prodromus) 1 described R. acicularis Lindl. under its variety 
Bourgeauiana (R. Bourgeauiana Crép. at first). 
In his monograph, Watson described an arctic form under 
the name R&. acicudaris Lindl. taking up a second species under 
the name &. Sayz, to which he referred my variety Bourgeauiana. 
According to this author this second species extends less north- 
ward than the first. Under these two names are there really two 
distinct species? I do not think so. It appears to me almost 
incontestable that the differences used by Watson to separate 
his &. actcularis from R. Sayi are not constant, and hence without 
true value. 
In describing his R. acicularis of the arctic zone, he seems to 
try to bring together as near as possible the American form with 
the form of the old world in attributing to it leaves of five leaflets, 
elongated receptacles, leaflets mostly with simple teeth and not 
glandular beneath, and entire sepals. I have not seen specimens 
from Alaska, but I have received some obtained from Fort 
Simpson, along the Pelly River, in 63° lat., and in the upper part 
of the Liard River, in 60° 30’ lat. These specimens show leaves 
of five to seven leaflets, leaflets glandular beneath and with glan- 
dular-compound teeth, sepals all entire or the exterior ones 
provided with one or two lateral appendages, and fructiferous 
receptacles globular or elongated-ovoid. I have reason to sup- 
pose that the Alaskan form is not different from those to which 
I have just alluded. As for R. Sayi, to which Watson attrib- 
utes globular fructiferous receptacles and appendaged exterior 
sepals, it almost always occurs with entire sepals, and if the 
receptacles are often globular they are not very rarely oblong- 
ovoid. It is a variety of R. Sayi with elongated receptacles 
which has served Watson for the establishment of his R. 
Engelmanni.3 
There is no doubt in my mind that under the names R. 
acicularis Lindl. sec. Wats., R. Sayi Schwein., and R. 
Engelmanni Wats. there exists only a single and unique type, 
3Cf. Observations on Rosa Engelmanni Watson, in Bull. Soc. bot. Belg. 287: 
93-95. 
