130 
SILVA OF NORTH AMERICA. 
SALICACE. 
Tucson,’ Arizona, and is scattered along mountain streams in southern Arizona, through Mexico to 
Guatemala? and Lower California.® 
The wood of Salix taxifolia has not been examined. 
which he achieved remarkable results. At this time he produced, 
by crossing and selection, the Snow Flake, Ruby, and Alpha pota- 
toes, and supplied potato-breeders with seeds from which many 
other named varieties have been obtained ; he raised the Champion, 
Defiance, Superior, Green Mountain, and other varieties of wheat 
which have been cultivated successfully in the eastern states, Cali- 
fornia, and Australia, the Triumph and other varieties of oats, and 
the Conqueror and Little Gem tomatoes ; and from the crossing 
of Apples, Pears, Plums, Grapes, Raspberries, and other plants he 
obtained many interesting hybrids. Satisfied with his labors in this 
field, Mr. Pringle turned his attention to systematic botany, in which 
he had been interested from boyhood, and about 1876 commenced 
to make sets of the rare plants of northern New England for dis- 
tribution. As a collector he was as successful as he had been in 
other fields of activity, and no one has ever selected and prepared 
specimens for the herbarium with greater intelligence and skill. In 
1880 Mr. Pringle was appointed special agent of the Forestry Divi- 
sion of the 10th Census of the United States, and for two years 
explored the forests of northern New England and New York, 
studying their composition and resources. This duty performed, 
he made for the Jesup Collection of North American Woods of 
the American Museum of Natural History a large collection of 
timber specimens from some of the most inaccessible and difficult 
regions of Arizona, California, Oregon, and Washington. Becom- 
ing interested during this journey in the flora of Mexico, he has 
for the last twelve years devoted himself exclusively to its ex- 
ploration. During his annual journeys, which have extended over 
many of the states, he has made large and unrivaled collections 
which have been acquired by the principal herbaria of the United 
States and Europe, and has discovered many undescribed genera 
and species. In recognition of his services to botany, Asa Gray 
dedicated to him the genus Pringleophytum, an herb of the Acan- 
thus family which he found in 1884 in a region of northern Sonora, 
which he was the first botanist to traverse, and his name is asso- 
ciated with many other Mexican plants of his discovery. 
1 In Arizona Salix tazifolia has also been collected in cafions of 
the Santa Catalina Mountains by C. G. Pringle, and in 1894 in 
cafions of the Santa Rita and Swissholm Mountains by Professor 
J. W. Toumey. 
* Hemsley, Bot. Biol. Am. Cent. iii. 180. 
3 Brandegee, Zoé, iv. 406. 
EXPLANATION OF THE PLATE. 
Prats CCCCLXXVI. Sarix TAXIFOLIA. 
1. A flowering branch of the staminate tree, natural size. 
SD om w DY 
. A capsule, enlarged. 
. A staminate flower with its scale, front view, enlarged. 
. A flowering branch of the pistillate tree, natural size. 
. A pistillate flower with its scale, front view, enlarged. 
. A fruiting branch, natural size. 
