30 MISC. PUBLICATION 303, U. S. DEPT. OF AGRICULTURE 



of different sections of the country have supplied others. A few 

 names have been collected by the author, more notably in the South- 

 west where, incidentally, a great many plants as well as towns, rivers, 

 and mountains, are called by Mexican or Spanish names. 



Nevertheless, there yet remain several hundred species that do not 

 bear distinctive vernacular names. They appear in the list with 

 no other than a Latin name, the author believing that one person is 

 not armed with sufficient authority to coin names for them. 



Many species appear under a number of different vernacular names, 

 some of which may also be applied indiscriminately to various other 

 species. In this work the selection of the most descriptive name has 

 been made after careful consideration of the characters of the j)lant. 

 The common name is placed opposite the Latin name ; the remaining 

 synonymous vernacular names may be found in the list of common 

 and scientific names of woody plants (p. 322). The more commonly 

 used vernacular names are there referred to the species that often 

 bears them. Incidentally, this discussion should inform those less 

 familiar with plant names that the use of a common name, where ex- 

 actitude is desired, is never as satisfactory as the use of the correct 

 Latin name. 



RANGE 



The user of the woody plant list will find a series of numbers under 

 each species after Range. Each number refers to a plant-growth 

 region shown on Mulford's map (fig. 1). The series of numbers 

 under any given species expresses its approximate geographic range. 



To determine the plant-growth regions in which a plant can be 

 planted with most confidence, the geographic range of the particular 

 species was superimposed upon a map of Mulford's growth regions. 

 The numbers were then read off. In many instances a plant may be 

 found growing naturally in only a portion of a growth region, but as- 

 suming conditions within a given region to be reasonably constant, 

 the plant is stated to be able to grow anywhere in the entire growth 

 region. For this reason, it is obvious that the actual geographic 

 range of any native species is not necessarily expressed with 

 exactitude. 



Interpretation of distribution with respect to the plant-growth re- 

 gions has been conservative. The range of each species has been 

 checked against records in local floras and published citations of spec- 

 imens. Where a question exists, the growth region involved has been 

 omitted. The growth regions herein published, therefore, depend in 

 no way upon any belief the author may have that the planting of a 

 given species will probably be safe in adjacent growth regions. If 

 a growth region is listed for a species it has been ascertained that 

 the plant actually does grow there. 



Comparison of climatic and soil conditions in one growth region 

 with those in others may point the way to the introduction of a 

 species from one region to another. Here as with other considera- 

 tions, in this work the facts only are presented; any conclusions 

 drawn from them must be those of the user of the list. 



SITE DESIGNATIONS 



Plants grow in dry soil, moist soil, or in fresh or well-drained soil. 

 They are to be found in the sun, or in the shade, or in both, or some- 



