2 NATL. ARBORETUM CONTRIB. NO. 2, U.S. DEPT. AGR. 



Although plants that obviously are not true to name can be 

 readily eliminated from collections and research consideration, 

 misnamed plants that closely resemble correctly named plants can 

 cause problems. Differences in disease susceptibilities, hardiness 

 reactions, and genetic variations can result in misleading research 

 conclusions. 



Because of the effects of misnamed crabapple plants, in 1965 

 I attempted to locate those crabapple species, varieties, and cul- 

 tivars most likely to be correctly labeled. I believed this project 

 could be best carried out by seeking original type plants or, in the 

 case of named cultivars, the parent plants or direct asexual prop- 

 agations from these plants. These plants had to be sought through 

 some of the larger botanic gardens, arboretums, parks, and related 

 institutions that kept accessioning records. To accomplish this, in 

 August 1965, letters (Appendix 1) accompanied by questionnaires 

 (Appendix 2) were sent to many of the previously mentioned types 

 of institutions in the United States and Canada. After the question- 

 naires were returned and the information was recorded, a con- 

 firmation list (Appendix 3) was sent to each participant to insure 

 that the questionnaires were understood. 



The questionnaires, all confirmation copies, and additional 

 letters resulting from this project are on file at the National 

 Arboretum. 



This report contains the results of the National Arboretum 

 1965 crabapple survey and is divided into two parts. Part I is a 

 compilation of all the crabapple taxa recorded in this survey, with 

 locations for documented material of authentic origin. All pertinent 

 historical data available to me relating to these plants have been 

 included. Sources for original published descriptions and illustra- 

 tions are listed for most species and varieties and some cultivars. 

 The descriptions for the remaining cultivars are from nursery 

 catalogs or Arie F. den Boer's notes on species and varieties of 

 flowering and economic crabapples. 2 Descriptions are presented 

 in general terms since technical descriptions of the plants are 

 beyond the scope of this endeavor. 



Part II contains diagrammatic genealogical schemes relating to 

 the progeny of the crabapples of authentic origin cited in Part 1. 



For convenience and clarity in this report, I am including a 

 key to the location of reported documented crabapple material of 

 authentic origin and a key to originators or introducers of cultivar 

 progeny. 



Unpublished data. 



