| Cultivar | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Abba Diane Reeck' | Medium | Dark-Green | Medial | White | Unknown | - | - | Aden, Paul & Zilis, Mark | .2010 |
| 'Abba Lilian Cannon' | Large | Med-Green | Streaked | White | Sport | Light-Purple | July | Wade, Van | --NR-- |
| 'Abigail Adams' | - | - | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Abiqua Jim Dandy' | Miniature | Med-Green | - | - | Unknown | Pale-Lavender | July | Purtymun, Charles & Walek, Kevin | .2009 |
| 'Abraham Lincoln' | Medium | Blue/Green | - | - | Hybrid | Light-Purple | June into July | Beilstein, Doug & Zilis, Mark | .2009 |
| 'Ace Bill Wundram' | Medium | Dark-Green | Marginal | Yellow | Unknown | - | June into July | Freeman, Franc & Freeman, Sally | .2008 |
| 'Ada Reed' | Medium | Yellow | - | - | Hybrid | Light-Purple | June into July | Suggs, Natalee | .1988 |
| 'Ada Robinson' | Medium | Dark-Green | Marginal | White | Unknown | Near-White | June into July | Goodwin, Randy | .2018 |
| 'Adrian Köhlein' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Aidan Bryden Cleghorn' | Small | Dark-Green | Marginal | Yellow | Unknown | Pale-Lavender | July into August | Chamberlain, Steve | .2006 |
| 'Alan Titmarsh' | Large | Med-Green | Medial | Yellow | Sport | Pale-Lavender | July into August | Ford, Richard & Ford, Mary | .2006 |
| 'Albert Lea' | Large | Blue/Green | - | - | Sport | Near-White | June into July | Ruh, Peter | .1999 |
| 'Alex Summers' | Large | Blue/Green | Marginal | Yellow | Sport | Pale-Lavender | June into July | Santa Lucia, Vic | .1989 |
| 'Alexizz Madison' | Small | Blue/Green | Marginal | White | Sport | Light-Purple | July | Xavier-Sakr, Suzzane | .2005 |
| 'Alice Gladden' | Large | Yellow | - | - | Hybrid | Near-White | June into July | Ward, Dr Dick & Ward, Jane | .1998 |
| 'Alice McConnel' | Medium | Med-Green | Marginal | White | Unknown | Pale-Lavender | June | Anderson, Jim | --NR-- |
| 'Allan P. McConnell' | Medium | Med-Green | Marginal | White | Unknown | Pale-Lavender | July into August | McConnell, Allan & Seaver, Mildred | .1980 |
| 'Allan P. McConnell All Green' | Small | Med-Green | - | - | Sport | Med-Lavender | July into August | Wade, Van | --NR-- |
| 'Allen C. Haskell' | Large | Dark-Green | Streaked | Yellow | Unknown | Pale-Lavender | July | Seaver, Mildred & Walek, Kevin | .2009 |
| 'Alley Oop' | Small | Med-Green | Streaked | White | Sport | Light-Purple | July into August | Malloy, Alex | .2001 |
| 'Alleyne Cook' | Large | Blue/Green | Marginal | Yellow | Sport | Pale-Lavender | July into August | Cook, Alleyne & Hodgson, D. | .2003 |
| 'Amber Dietrich' | Small | Med-Green | Streaked | Speckles | Unknown | Light-Purple | June into July | Dietrich, Debbie | --NR-- |
| 'Amy Aden' | Small | Med-Green | Streaked | Yellow | Hybrid | Pale-Lavender | July | Aden, Paul | .1980 |
| 'Amy Aden Rim' | Small | Yellow | Marginal | White | Sport | Med-Lavender | July | Aden, Paul | --NR-- |
| 'Amy Aden-Stable Form' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Amy Stewart' | Medium | Blue/Green | - | - | Unknown | - | - | Stark, Gunther | --NR-- |
| 'Andrew Dennis' | Large | Blue/Green | Marginal | White | Unknown | - | - | Weissenberger, Henry & Zilis, Mark | .2010 |
| 'Andrew Jackson' | Giant | Blue/Green | - | - | Unknown | Near-White | June into July | Sugita, Hajime & Ruh, Peter & Ruh, Jean | .2001 |
| 'Andrew M. Wright' | Medium | Med-Green | Marginal | Yellow | Unknown | - | - | Chamberlain, Steve | .2014 |
| 'Andy Murray' | Medium | Blue/Green | Marginal | Yellow | Hybrid | Pale-Lavender | July into August | British Hosta and Hemerocallis Society & Solberg, Robert | .2013 |
| 'Andy Taylor' | Small | Med-Green | - | - | Hybrid | Near-White | July | Avent, Tony | .1993 |
| 'Ann Knall' | - | Yellow | - | - | Unknown | - | - | Trucks, Gary | --NR-- |
| 'Ann Kulpa' | Large | Med-Green | Medial | White | Hybrid | Near-White | July into August | Kulpa, John | .1999 |
| 'Anna Boynton' | Medium | Med-Green | Medial | Yellow | Hybrid | Near-White | July | Heinke, Gretchen | .2005 |
| 'Anna Lindh' | Medium | Light-Green | Medial | White | Unknown | Med-Lavender | August to September | Kósa, Lehel | .2005 |
| 'Anna Mae' | Medium | Blue/Green | Marginal | Yellow | Unknown | Pale-Lavender | - | Savory, Dennis | .2012 |
| 'Annabel Lee' | Medium | Dark-Green | - | - | Unknown | Light-Purple | - | Scheer, Alttara | --NR-- |
| 'Anne Arett' | Small | Med-Green | Marginal | White | Sport | Light-Purple | July into August | Arett, Anne | .1975 |
| 'Anne Arett No. 39' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Anthony Gattrell' | - | Med-Green | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Arlene Mae Savory' | Small | Blue/Green | Medial | White | Sport | Med-Lavender | June into July | Savory, Dennis | .2009 |
| 'Arnold Black' | Large | Yellow | - | - | Hybrid | Pale-Lavender | June into July | Ward, Dr Dick & Ward, Jane | .2004 |
| 'Art Shane' | Small | Med-Green | Marginal | Yellow | Unknown | - | - | Aden, Paul | --NR-- |
| 'Audra Wilson' | Large | Med-Green | Streaked | Yellow | Unknown | - | - | Benedict, Dr Ralph (Herb) | --NR-- |
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