Host PLANT LIST 413 
Host Plant List 
This list includes all host plants recorded in connection with the fore- 
going descriptions of both the Aphids taken in the region herein treated and 
genotypes not as yet found here but included in descriptions for the purpose of 
establishing the concept of the genus. 
The determinations of the plants were made with the assistance of various 
members of the Departments of Botany, Forestry and Horticulture for the past 
half century, and given a final checking for synonymy by H. D. Harrington, 
present taxonomist of the Botany Department. Botanical works also used in the 
preparation of this list not only for scientific names, but more especially for the 
common names, are as follows: 
Bailey, L. H., 1903. Cyclopedia of American Horticulture. Doubleday Page and 
Co., New York. 
Rydberg, P. A., 1906. Flora of Colorado. Published by Experiment Station, Fort 
Collins, Colorado. 
Coulter, John M. (Revised by Aven Nelson), 1909. New Manual of Botany of 
Central Rocky Mountains. American Book Co. 
Britton and Brown, 1913. Illustrated Flora of Northern United States, Canada 
and the British Possessions, 2d ed. Charles Scribner’s Sons, New York. 
Rydberg, P. A., 1917. Flora of the Rocky Mountains and Adjacent Plains. Pub- 
lished by the author. 
Hitchcock, A. S., 1920. Genera of Grasses of the United States, Bul. No. 772, 
United States Department of Agriculture (Professional Paper). 
Kelsey, Harlan P., and William A. Dayton, 1942. Standardized Plant Names, 2d 
ec, J. Horace McFarland Company, Harrisburg, Pa. 
Longyear, Burton O., 1927. Trees and Shrubs of the Rocky Mountain Region. 
G. P. Putnam’s Sons, New York and London. 
Thornton, B. J., and L. W. Durrell, 1933. Colorado Weeds, Colorado Experiment 
Station Bul. 403. 
Ashton, Ruth E., 1933. Plants of Rocky Mountain National Park. United States 
Government Printing Office, Washington. 
Forest Service, United States Department of Agriculture, 1937. Range Plant 
Handbook. United States Government Printing Office. 
Pesman, M. Walter, 1943. Meet the Natives, 2d ed. The Smith Brooks Printing 
Co., Denver, Colo. 
The Year Book of Agriculture, 1948. House Document No. 480. 
Preston, Richard J., Jr., 1948. North American Trees. The Iowa State College 
Press, Ames, Iowa. 
Abies concolor (White Fir) Acer campestre (Hedge Drepanaphis utahensis 
Cinara curvipes Maple) Periphyllus americanus 
Cinara occidentalis Drepanosiphum platanoides Acer negundo (Boxelder) 
Abies lasiocarpa (Alpine Acer glabrum (Rocky Drepanosiphum braggii 
Fir) Mountain Maple) Periphyllus negundinis 
Cinara curvipes Periphyllus americanus Acer platanoides (Norway 
Cinara lasiocarpae Periphyllus brevispinosus Maple) 
Cinara occidentalis Acer grandidentatum Drepanosiphum platanoides 
Mindarus abietinus (Bigtooth Maple) Periphyllus lyropictus 
Acer sp. (Maple) Drepanaphis granovskyi Acer pseudoplatanus 
Periphyllus testudo Drepanaphis spicata (Planetree Maple) 
