Amos Perry and Calsibes
: A group of species hybrids
involving a pacific coast native and a Siberian Iris. The first of these crosses was produced by Amos Perry
and named 'Margot Holmes'
. 'Margot Holmes' was such a radical new type of Iris and so beautiful that it won the first British Dykes Medal
Pery's calsibes were numerous but little information is availalable about many, only their names which because they used Foster's naming system revel their parentahe' Note they often get filed under Siberians since the Spx class did not exist then.
Despite the excitement very few of this new class of Iris were produced perhaps because they were sterile and did not lend themselves to continued hybridization. In the 1960's Jean Witt continued this experimentation producing new hybrids and she coined the name Cal-sibe for this group. At the same time Lorena Reid was performing these crosses also and Jean Witt and Lorena introduced several through Lorena's Lauries Garden.
In Germany Tomas Tamberg was perfoming many interesting crosses and conversions to tetraploidy to overcome sterility. Unfortunately many of these crosses have not been introduced to the world at large. And many never were registered. For a photograpic record of some of these seeTetraploid Cal-Sibes
The genius of Tomas Tamberg
(Quoted from Tamberg website)
"CALSIBE HYBRIDS (DIPLOID)
Hybrids with 2n=40 chromosomes, whose parents can be the species of the Californicae group (Iris douglasiana, Iris innominata, Iris tenax, Iris munzii etc.) on one side and the species of the Chrysographes group (Iris chrysographes, Iris delavayi, Iris clarkei, Iris bulleyana, Iris forrestii und Iris wilsonii) on the other side. Both groups have the same chromosome number of 2n=40, but the chromosomes of both groups are not sufficiently analogue, and the diploid hybrids are, therefore, sterile. - Since they begin to sprout relatively early, Calsibe hybrids suffer especially from late frosts. However, the are not sensitive against permant low winter temperatures."
unplaced: 'Elfenkind' 'Jever Vulkan'
By converting these diploids to tetraploids Tamberg created a new fertile family.
Tambergs's 2005 website Gives the following
"CALSIBE HYBRIDS (TETRAPLOID)
Hybrids with 4n=80 chromosomes,which can be derived from the same species as diploid Calsibe hybrids, but have double the number of chromosomes and, therefore, larger flowers. Such hybrids can either be produced directly by colchicine treatment or as a result of crosses between tetraploid parent plants. Such hybrids are fertile: in the process of the reduction of chromosome numbers during the production of sexual cells each chromosome, due to the tetraploid structure, finds an analogue counterpart chromosome of its own kind. - The flowers of Tetra-Calsibe hybrids of advanced generations belong to the most spectacular types of iris flowers.
Tetra-Calsibe hybrids can be back-crosses to tetraploid Chrysographes hybrids. We call the resulting 3/4 Chrysographes-1/4 Californicae hybrids Sibcal hybrids."
Tamberg Tetraploid Calsibes
Tamberg tetraploid "sibcals"
Sibcal hybrids (3/4 Chrysographes-1/4 Californicae) und 1/4 Chrysographes-3/4 Californicae-hybrids
And beyond with Tet Chrysata x Tet Calsibe
-- Main.RPries - 2010-07-21