32 THE AMERICAN MIDLAND NATURALIST 



quently in the text allotted to the species. Our genus would be 

 confined to two lilliputian species, A. deflexus and A. splendens, 

 and one giant A. Lamberii, all with splendid differential limits, 

 and it would be a more perfect system. A beautiful card-castle of 

 proposed species torn down at the same time would add to the 

 "victory," but this calamity ought not to disturb the sleep of the 

 just. 



Xanthium. " Interdum dormitat bonus Brittonus" most likely 

 thought Dr. Bergman when he found that Dr. Britton, who had 

 only one native species in his 111. F., had allowed 7 additional 

 native species to slip into his manual. This rate of admittance of 

 species no doubt was too fast to win Dr. Bergman's approval, 

 and he took a middle course in his flora, admitting just 2 speci s: 

 i) A', cartadense (which assimilated A'. Pennsylvanicum) ; and 2) 

 X. echifiatum which included A", glandulijerum, and at the same 

 time he mastered into service under said name a specimen 

 of A', speciosum collected by me at Minot Aug. 20, 1905. X. com- 

 mune and. A. acerosum have not even received an honorable mention 

 but they wot Id in all probability I'ave been incorporated with 

 A", echinaium. 



Arnica udgens Pursh. The name of the Dakota plant is correctly 

 A. pedunculate Rydb. or A. monocephala Rydb. 



Alisma brevipes Greene (A. superbum Lunell). The synonymy was 

 proposed, if I am not mistaken, in the N. Am. Flora and adopted 

 in Rydb. Rocky Mt. Flora and in this report. The outside world 

 has not yet seen the real type of my A. superbum. It is in my 

 herbarium and will be open to inspection under certain conditions. 



Potamogeton pectinatus. The specimen cited from Lake Ibsen is 

 P. Friesii, and I can not imagine how it was labeled otherwise. 



Avena Torreyi Nash. Known since the beginning of this cen- 

 tury also from the Devil's Lake Chatauqua grounds, where it has 

 been collected by me repeatedly. 



K asked for my impression of the botanical part of this report 

 I venture to say this: While teaming with an abundance of knowl- 

 edge amassed from the year of 1753 until the first part of this 

 century, it has either from waning interest in the subject or from 

 difficulties in reaching the material to be studied, or on account 

 of its author's removal from this botanical field — not paid sufficient 

 attention to the notable advances of the latest years. 



Leeds, North Dakota. 



