xvi STANDARDIZED PLANT NAMES 



HOW TO USE STANDARDIZED PLANT NAMES 



This Catalogue includes both the scientific and the common names, ap- 

 proved and synonymous, of plants in American commerce, very fully cross- 

 indexed and arranged in one continuous main alphabetic sequence. 



Throughout, the approved scientific names are in bold-face, whether in 

 CAPITALS or in small letters. Synonyms and unapproved jiames are invari- 

 ably in italic, either stnall letters or CAPITALS. Approved common names 

 are always in Small Capitals. 



These typographic distinctions make the use of the catalogue easy. The 

 cross-indexing will facilitate finding approved names, directly or through 

 synonyms. 



The words constituting the main alphabetic sequence are at the left-hand 

 margin of the columns. They are mainly the genus names, common and 

 scientific, such as ABIES and Fir, cross-referenced to each other. 



Following a scientific genus name is the alphabetic list of species of that 

 genus, each accompanied by its common name, and by an italicized synonym 

 when a synonym is in well-established and authoritative use, as, under ABIES, 

 "A. pectinata {A. picea Cy; A. alba Ag-Ar) . . . Silver Fir." Cross refer- 

 ences are given from such synonyms in their proper alphabetic order. 



Following a scientific species name and further indented to the right are 

 hsted alphabetically the names of natural varieties of that species recognized 

 by botanists and found in American commerce, as, "A. homolepis umbilicata 

 (umhellata) . . . Dimplecone Fir." The horticultural varieties of a genus 

 are placed together in a special list, following the list of species of that genus, 

 and arranged in the alphabetic order of their common names. There is usually 

 a reference to this special horticultural variety hst under each species of 

 which there are varieties to be found in the Ust. Thus, under A. pectinata 

 is the note "See also hort. var. list on page 2," and under the heading "Hort. 

 var. of Abies" is found "Sentinel Silver Fir {A. pectinata pyramidalis^ Cy)." 

 In very short species lists, such as Allamanda, and in genera in which most 

 of the species have horticultural varieties, such as Azalea and Rosa, the refer- 

 ences to the horticultural variety list are omitted. 



A plant having a recognized Latin name and a recognized common name 

 is entered under each of its names; for example Sugar Maple, Acer saccharum, 

 IS entered under A, M, and S: In the case, however, of the very large number 

 of horticultural varieties that have no recognized Latin name, no entry is 

 made under the adjective; for example. Firefly Azalea is entered under A 

 but not under F. 



^^'ojlowing the common name of a genus in the main alphabetical list is an 

 alphabetical hst of common names of species and varieties of that genus (except 

 when the great length of such a hst, as in case of Rose makes it reasonable to 

 refer to the full list under the scientific name of the genus) and also of com- 

 pounds of that genus name applied to plants belonging to other genera; as 

 under the heading Apple (Malus), is found Custard-apple, although, of course, 

 Custard-apple also appears in the main alphabetical list under C. 



