Cultivar Name Plant Size Leaf Color Variegation Var Color Origin Flower Color Season Source Registered 'Yellow River' Medium Med-Green Marginal Yellow Unknown Near-White July Smith, Eric & Ruh, Peter .1993 'Yosemite Valley' Giant Yellow - - Hybrid - - Petryszyn, Olga .2010 'Yukon Gold' Medium Yellow - - Hybrid Pale-Lavender July into August Ward, Dr Dick & Ward, Jane .2015 'Yukon River' Medium Blue/Green - - Unknown - - Malloy, Alex --NR-- 'Yuma' (Livingston) Medium Light-Green   - Unknown Light-Purple - Livingston, Ron --NR-- 'Yuma' (Wade) Large Blue/Green - - Hybrid Pure-White June into July Wade, Van .2007
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