38 SILVA OF NORTH AMERICA. 
the level of the sea. 
CUPULIFERZ. 
Here it is abundant, growing with Pinus edulis, Pseudotsuga taxifolia, Abies 
concolor, Cercocarpus ledifolius, Quercus Gambelii, Cowania Mexicana, Fraxinus anomala, Fraxinus 
cuspidata, and Amelanchier alnifolia, and here, remote from the other species of the genus, it was 
found by Mr. Frank H. Knowlton’ on September 10, 1889.’ 
The wood of Ostrya Knowltoni is hard, close-grained, compact, and light reddish brown, with 
thin sapwood.’ 
1 Frank Hall Knowlton was born in Brandon, Rutland County, 
Vermont, September 2, 1860. He was educated in the schools of 
his native place and at Middlebury College, Vermont, where he was 
graduated in 1884, and was then appointed an aid in the United 
States National Museum at Washington, a position in which he re- 
mained for three years. He was then made assistant curator of 
botany in the National Museum, and in 1889 he was appointed 
assistant paleontologist of the United States Geological Survey, 
a position which he still occupies, and passed several months in 
collecting in the southwest. Since 1887 Mr. Knowlton has filled 
the chair of Botany in the Columbian University in Washington. 
He is the author of many important papers on paleobotany pub- 
lished in the Proceedings of the United States National Museum and 
in the Bulletins of the United States Geological Survey. 
2 Ostrya Knowlioni was subsequently collected in fruit by Pro- 
fessor J. W. Toumey in July, 1892. The trees were visited by 
Professor Toumey and myself in September, 1894, when no traces 
of fruit could be found upon them. For flowering specimens col- 
lected in May, 1895, I am indebted to Mr. L. H. Tolfree of Tol- 
free, Arizona. 
8 The trunk specimen of Ostrya Knowltoni in the Jesup Collec- 
tion of North American Woods in the American Museum of Natural 
History, New York, is four inches in diameter inside the bark, and 
shows seventy-six layers of annual growth, six of which are of sap- 
wood. 
EXPLANATION 
Pirate CCCCXLVI. 
. A stamen, enlarged. 
. A nut, enlarged. 
WONAD NP w OS 
OF THE PLATE. 
OstryA KNOWLTONI. 
A flowering branch, natural size. 
. A scale of the staminate ament, rear view, enlarged. 
A staminate flower with its scale, front view, enlarged. 
. Pistillate flowers with their scale, front view, enlarged. 
. A fruiting branch, natural size. 
. A fruiting involucre, natural size. 
- End of a winter branch with staminate aments, natural size. 
