28 SILVA OF NORTH AMERICA. ROSACEZ. 
over five thousand feet above the level of the sea, and ranges southward over some of the mountains of 
northern Mexico.' It was discovered near Frontera, New Mexico, in July, 1851, by Mr. Charles 
Wright.’ 
1 Chihuahua, Thurber, August, 1852 (No. 772 in Herb. Gray). 2 See i. 94, 
Pifion, Sonora, Hartmann, 1894 (Archeological Expedition to 
Northwestern Mexico, No. 366) (In Herb. Gray). 
EXPLANATION OF THE PLATE. 
Pirate DCXXXIV. CrERcocARPUS BREVIFLORUS. 
. A flowering branch, natural size. 
A flower, enlarged. 
. Vertical section of a flower, enlarged. 
. An anther, enlarged. 
A fruiting branch, natural size. 
. A fruit, enlarged. 
- Vertical section of a fruit, enlarged. 
PADA PWD 
. A seed, enlarged. 
