72 I. M. JOHNSTON 



The area, 1 thus defined, is triangular in shape and contains ap- 

 proximately 150 square miles. Mt. San Antonio, or Baldy as we 

 shall call it hereafter, is of especial interest, for besides being the 

 highest peak in the San Gabriel Mountains, it is one of the four 

 peaks in Southern California which ascends above the 10,000 

 foot contour. Connected to Baldy by pine clad ridges, which 

 average over 7500 feet altitude, are a number of lesser peaks. 

 These are, — Pine Mountain (alt. 9660 feet), Telegraph Peak (alt. 

 9008 feet), Cucamonga Peak (alt. 8911 feet), Ontario Peak (alt. 

 8752 feet) and Iron or Sheep Mountain (alt. 8028 feet). 



The San Antonio Mountains have been explored by all the 

 well known botanists of Southern California. The first to visit 

 the mountains was Mr. S. B. Parish, who ascended them in 1880. 

 Prof. A. J. McClatchie was the next visitor, who collected on 

 Baldy in August, 1893. During the successive springs of 1899 

 and 1900 Dr. H. M. Hall explored and made collections on the 

 northern base of the mountains. In July of 1901 and 1902 Dr. 

 LeRoy Abrams visited Baldy Summit and in the summer of 1908, 

 accompanied by Mr. E. A. McGregor, he collected in Swartout 

 Valley and Lone Pine Canon. Several other persons have made 

 collections in the San Antonio Mountains, among whom are, — 

 Mr. J. B. Leiberg, Mrs. Charlotte M. Wilder and Mr. Fred Bur- 

 lew. It is interesting to note, that with the exception of Professor 

 McClatchie and Mrs. Wilder, all the collectors worked on the 

 north side of the mountain. The most of the collecting seems to 

 have been done along the so-called, "Glen Ranch Trail to Baldy." 

 Although the mountains have had a number of visitors they have 

 had by no means a thorough botanical exploration. The visitors 

 have made but hurried dashes into the more accessible parts, 

 covering the same ground as their predecessors, and spending in 

 the pine belt only a day or two. Realizing that much of the 

 mountain was either untouched or very imperfectly known we 

 planned and made a series of ten collecting trips into the pine 

 belt. These trips, which were made during the spring and sum- 



1 The San Antonio Mountains have been mapped by the government and are 

 to be found on the San Antonio and Cucamonga topographical quadrangles of 

 the U. S. G. S. 



