Let. - letter as in Holly Letter 



If. (lvs.) - leaf (leaves) 



m - meters 



mm - millimeters 



NA - U.S. National Arboretum, 3501 New York Avenue NE., 



Washington, DC 20002 



NA # - U.S. National Arboretum accession number 



no. - number, numeral 



Nurs. (nurs.) - nursery (nurseries) 



orig. - originated, origin 



p. (pp.) - page (pages) 



pat. - patent as in plant patent 



PI - U.S. Department of Agriculture Plant Introduction Accession 



pit. (pits.) - plant (plants) 



poll. - pollinated, pollinate 



Proc. - Proceedings 



propag. - propagators, propagation 



pt. - part 



rec. - received 



ref. (refs.) - reference (references) 



reg. - registration 



rev. - revised, revision 



sdlg. (sdlgs.) - seedling (seedlings) 



sel. - selected, selection, selections 



Soc. - Society 



sp. - spring 



sta. - station 



subsp. - botanical rank of subspecies 



syn. (syns.) - synonym (synonyms), synonymy 



unkn. - unknown 



U.S. - United States of America 



USDA - U.S. Department of Agriculture 



var. (vars.) - variety, varieties, varietas, varietates 



vs. - versus, contrasted with, against 



'...'- single quotation marks used only to designate cultivar names 



"..." - direct quotation 



" - inch or inches 



X - multiplication sign, signifying hybridity 



16 



