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RE: Hyb: Umbrata pattern

 Some information of note follows. This was published after the World of Iris was published   so probably got ignored. Dr. Henderson was a Biology profesor who had puzzled over pigments and patterns for over 30 years. The spot theory was also proposed by Walter Welch and he had some good test data to back what he was saying.

Chuck Chapman

Henderson, Norland "Color-Patterns in the Tall-Bearded Iris" BAIS #241 April 1981

"Iris variegata, a light yellow iris species from Europe has maroon veining on the falls that spreads in some forms to produce a maroon spot covering the entire blade except for a narrow yellow margin. This spot of deep blue-violet is an overlay since it is restricted to the cells of the upper epidermis. It was discovered that this dominant deep blue-violet could also be added to a recessive white or a light blue-violet flower. If the ground color is white , the flower has white standards and deep blue-violet falls with a white margin. If the ground color is light blue, the standards are light blue-violet and the falls are deeper blue-violet with a lighter margin. This particular pattern carries its own concentration of pigment and does not alter the other pigments that might be present at all. However, if an iris carrying this   gene is crossed to an inhibited white, the spot will also be inhibited and thus will not appear. Since this gene came from I. variagata , it should be designated the bVariegata-pattern.""

Chuck Chapman

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