THE FLORA OF NORTH AMERICA, 41 
in America in 1868, and settled in 1880 near Lake Coeur d’Aleen, 
Idaho. He accompanied Dr. Sandberg on his second botanical 
expedition to the mountains of Idaho in 1893, acted as field 
agent for the Botanical Division of the United State Department 
of Agriculture the summers of 1895 and 1896, and collected in 
Idaho, Washington, Nevada, and Oregon. In 1897, he became 
connected with the United States Geological Survey, up to 1903, 
and in 1905—6 carried on investigations in reference to the tim- 
ber supply of the Forest Reserves of Montana, Idaho, Oregon, 
California and Arizona and was Forestry Inspector in the Philip- 
ines in 1904—5. The following publications are from his hand. 
Contributions to the Flora of Iowa, 1870. 
Contributions to the Upham’s Flora of Minnesota, 1880. 
General Report on a Botanical Survey of the Coeur d’Alene Mountains in 
Idaho, 1895. 
Delphinium viridescens and Sambucus leiosperma, 1897. 
The Bitterroot Forest Reserve, 1899. 
The Priest River Forest Reserve, 1899. 
Forest Conditions in the Northern Sierra Nevada, California, 1902. 
Forest Conditions in the San Francisco Mountains Forest Reserve, Arizona 
[with T. F. Rixon and A. Dodwell]. 
Aven Nelson was born at Keokuk, Iowa, the 24th March, 
1859, his parents being Norwegians. He received his degree of 
M. S. in 1890, A. M. 1892, and Ph. D. 1904. He has been profes- 
sor of biology at the University of Wyoming since 1887. He is a 
prominent systematic and economic botanist, has made extensive 
collections in the Rocky Mountain region, especially in the state 
of Wyoming, and has built up the largest herbarium found within 
the Rocky Mountain states. He is one of the most prolific writers 
on systematic botany, and hundreds of new species have been 
described by him. The following are the most important of his 
publications: 
First Report on the Flora of Wyoming, 1896. 
The Worst Weeds of Wyoming, 18 
New Plants from Wyoming, I—XV, 1898—1904. 
Rocky Mountain Species of Thermopsis, 1898. 
The Trees of Wyoming and How to Know Them, 1899. 
The Western Species of Arga//us, 1899. 
New Species of Oreocarya and its Allies, 1899. 
Some Species of Tetraneuris and its Allies, 1899 
Some Notes on the Flora of Yellowstone National Park, 1899. 
Som Native Forage Plants on Alkali Soil, 1 
