This first photo of P. Robert Weltz is like one of the better clones we have at The Huntington and I have recently tossed out over a dozen of them with pinched sepals, paler colors and small size because they simply did not measure-up to Bob Weltz' standards.
Bob Weltz liked P. Skip Bartlett, trying to get clearer whites, larger sizes and good round shapes but he seldom got just what he wanted. That is not to say he did not produce some splendid hybrids using that hybrid.
It is highly doubtful to me that the plant carrying the darker flowers presented by Tam is properly tagged.
