| BAIL | Bailey, L.H. and E.Z. Bailey, Hortus Third: A Concise Dictionary of Plants Cultivated in the United States and Canada, MacMillan Publishing Co., Inc., New York , (1977). |
| GRIN | Agricultural Research Service, Germplasm Resources Information Network |
| HICK | Hickman, J.C., ed. 1993. The Jepson manual: Higher plants of California. Univ. California Press, Berkeley. 1400 pp. |
| MABB | DJ Mabberley, The Plant Book: A Portable Dictionary of the higher plants, Cambridge University Press, Cambridge, MA 1989. |
| FONA | Flora of North America |
| KART | Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C. |
| MANS | Mansfeld's World Database of Agricultural and Horticultural Crops, |
| REHD | Alfred Rehder, Manual of Cultivated Trees and Shrubs: Hardy in North America (Exclusive of the subtropical and warmer temperate regions), 2nd edition, 11th printing, The MacMillan Co., New York (1967) |
| NRCS | U.S. Department of Agriculture, Natural Resources Conservation Service, Plants Database |
| ACAD | Acadia National Park (Maine) |
| ANTI | Antietam National Battlefield (Maryland) |
| APCO | Appomattox Court House National Historical Park (Virginia) |
| BADL | Badlands National Park (South Dakota) |
| BICY | Big Cypress National Preserve (Florida) |
| BLRI | Blue Ridge Parkway (North Carolina) |
| BOWA | Booker T Washington National Monument (Virginia) |
| CATO | Catoctin Mountain Park (Maryland) |
| CHIR | Chiricahua National Monument (Arizona) |
| CHOH | Chesapeake and Ohio Canal National Historical Park (Maryland, Washington, D.C., and West Virginia) |
| COLO | Colonial National Historical Park (Virginia) |
| CRMO | Craters of the Moon National Monument (Idaho) |
| DETO | Devils Tower National Monument (Wyoming) |
| DEVA | Death Valley National Park (California) |
| DEWA | Delaware Water Gap National Recreation Area (Pennsylvania) |
| DINO | Dinosaur National Monument (Colorado) |
| DRTO | Dry Tortugas |
| EISE | Eisenhower National Historic Site (Pennsylvania) |
| EVER | Everglades National Park (Florida) |
| FOBO | Fort Bowie National Historic Site (Arizona) |
| FRSP | Fredericksburg & Spotsylvania National Military Park (Virginia) |
| GETT | Gettysburg National Military Park (Pennsylvania) |
| GEWA | George Washington Birthplace National Monument (Virginia) |
| GLAC | Glacier National Park (Montana) |
| GLCA | Glen Canyon National Recreation Area (Utah) |
| GRCA | Grand Canyon National Park (Arizona) |
| GRSM | Great Smoky Mountains National Park (North Carolina & Tennessee) |
| GWMP | George Washington Memorial Parkway (Virginia) |
| HAFE | Harpers Ferry National Historical Park (West Virginia) |
| HALE | Haleakala National Park (Hawaii) |
| INDU | Indiana Dunes National Lakeshore (Indiana) |
| KIMO | Kings Mountain National Military Park (South Carolina) |
| LAME | Lake Mead National Park (Nevada) |
| LAMR | Lake Meredith National Recreation Area (Texas) |
| MANA | Manassas National Battlefield Park (Virginia) |
| MIMA | Minute Man National Historical Park (Massachusetts) |
| MONO | Monocacy National Battlefield Park (Maryland) |
| NACC | National Capital Parks Central (Washington, D.C.) |
| NACE | National Capital Parks East (Washington, D.C.) |
| ORPI | Organ Pipe National Monument (Arizona) |
| PETE | Petersburg National Battlefield (Virginia) |
| PRES | Presidio National Park (California) |
| PRWI | Prince William Forest Park (Virginia) |
| REDW | Redwood National Park (California) |
| RICH | Richmond National Battlefield Park (Virginia) |
| ROCR | Rock Creek National Park (Washington, D.C.) |
| ROMO | Rocky Mountains National Park (Colorado) |
| SAAN | San Antonio Missions National Historical Park (Texas) |
| SACN | Saint Croix National Scenic Riverway (Wisconsin) |
| SCBL | Scotts Bluff National Monument (Nebraska) |
| SEKI | Sequoia and Kings Canyon National Parks (Californina) |
| SHEN | Shenandoah National Park (Virginia) |
| STRI | Stones River National Battlefield (Tennessee) |
| THRO | Theodore Roosevelt National Park (North Dakota) |
| THST | Thomas Stone National Historic Site (Maryland) |
| VICK | Vicksburg National Military Park (Mississippi) |
| WEFA | Weir Farm National Historical Park (Connecticut) |
| WOTR | Wolf Trap National Park (Virginia) |
| WUPA | Wupatki National Monument (Arizona) |
| YELL | Yellowstone National Park (Wyoming) |
| YOSE | Yosemite National Park (California) |
