abound with species not to be found on the hillsides, but species common to both plain and mountain will mark the progress of the season up the slope.
In the north temperate zone the moss if any will be found growing upon the north side of the tree trunk. Each hundred feet of elevation in a given latitude makes from one to two days difference in time of blooming. of plants. The character of the vegetation of a region is an index to its climate. Certain plants are adapted to frigid regions, others to temperate, and still others to tropical areas. Some plants are adapted to humid sections, while others are admirably adjusted to desert conditions. A knowledge of these differences in plants will be of the greatest value to the scout, and if this is supplemented by information about the value and uses of the variations plant products many hardships can be avoided. Many plants produce valuable juices, gums, and resins, while others yield us valuable timber for building and cabinet uses.
While it is impossible to even suggest the great variety of plants found within the confines of the United States, the following books on botany will be found helpful in each of the different sections for which they are designed.
Bibliography
For the botany of the Northeastern United States use:
"New Manual of Botany," 7th ed. Asa Gray.
"Illustrated Flora of the United Sates and Canada." N.L. Britton and Hon. Addison Brown.
For the botany of the Southern United States use:
"Flora of the Southern United States." A.W. Chapman.
"Southern Wild Flowers and Trees." Alice Lounsberry.
For the Botany of the Rocky Mountain region use:
"New Manual of Botany of the Central Rocky Mountains." John M. Coulter; Revised by Aven Nelson.
"Rocky Mountain Wild Flower Studies." Burton O. Longyear.
"The Trees of California." Willis Lion Jepson.
For general information regarding the shrubby plants of the United States use:
"Our Shrubs of the United States." Austin C. Apgar.
"Our Northern Shrubs." Harriet Louise Kceler.
For the wild flowers outside of those already mentioned for the Southern United States and the Rocky Mountain region use:
"Our Garden Flowers" Harriet Louise Keeler.
"How to Know the Wild Flowers." Frances Theodora Parsons.
"Field Book of American Wild Flowers." F. Schuyler Mathews.
