ox THE DISTRIBUTION OF CfeRTAIN TREES IN 

 CALIFORNIA. 



S. B. Parish 



HoLACANTHA Emoryi Gray. The first collection of this 

 species in California was made by Dr. J. G. Cooper in 1861, and 

 his reported station was "Providence Mountains," a desert range 

 in the southeastern corner of the Mojave Desert, a region where 

 a number of Arizona plants extend over to this side of the 

 boundary. Its flora is still imperfectly known, but the very few 

 botanists who have visited it in recent years have not found 

 Holacantha there. Indeed it remained unrediscovered in the 

 state until January. 1915, when specimens were received by Dr. 

 Jepson from Mr. R. H. Greer, who had collected them at the 

 Lava Beds, northeast of Daggett. In 1919 Miss R. S. Ferris 

 reported in this Bulletin (18:13) finding it near Ludlow, and in 

 a recent number (19:15. 1920) Mr. G. D. Thompson states that 

 prospectors had given him specimens from two stations near 

 Gofifs; one twenty-five miles north and the other twenty miles to 

 the south, in a wash on the road to Ward's Station. In ]\Iay 

 of the present year Dr. P. A. ]\Iunz and Mr. I. M. Johnston 

 found it growing in abundance along a wash about four miles 

 east of Lavic, extending, at least, from the highway to the rail- 

 road; the matted shrubs not exceeding four feet in height. All 

 these stations are in a limited area of the Mojave Desert; some 

 of them are probably identical, and it is not impossible that 

 Dr. Cooper may have collected his specimens within it, where 

 it appears not infrequent, so that it is remarkable that it re- 

 mained so long unrediscovered. 



In 1914 Dr. Jepson received from Mr. James Rennie specimens 

 of Holacantha from a place known as the Hay-fields, in the 

 Colorado Desert, and in Ma)^ of the present year Mr. E. E. 

 Schellenger brought me specimens from the same place, which 

 is about twenty-five miles east of Mecca, on the road to Blythe. 

 The road divides here into several branches, and only one of 

 them passes through the group, which consists of numerous 

 tree-like shrubs, the largest about eight feet high. This is the 

 western limit of the species, and is seventy-five miles from the 

 Mojave stations, and separated from them by a desert range. 

 / Celtis Douglasii Planch. A few specimens in some of the 

 larger herbaria were the only evidence of the presence of this 

 species in California, and the foundation on which it was re- 

 ported, under a different name, in Sargent's Sylva (7:72), and 

 in subsequent publications, from "the western rim of the Colorado 

 Desert." They were collected in 1885, by Mr. Daniel Cleveland, 

 the first, and long the only, botanist residing in southern Cali- 

 fornia. The station given on the label is "Laguna," the name 

 of a mountain in the southeastern part of San Diego county, 



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