CHRYTOSA HYBRIDS
Hybrids with 2n=39 chromosomes, derived from the species of the Chrysographes  group (Iris chrysographes, Iris delavayi, Iris clarkei, Iris bulleyana, Iris forrestii und Iris wilsonii) on one side and forms of  Iris setosa on the other side. Such hybrides are sterile at the diploid level, because the chromosome numbers of both parents are different and their chromosomes  are not analogue. -  Chrytosa hybrids are normally healthy and hardy  garden plants forming long living clumps with a species-like habit. The are difficult to produce. It needs a large number of controlled pollinations to get one or two viable seeds. Therefore, a conversion to the tetraploid level has not been managed so far in this way.

BERLIN CHRYTOSA (Reg. 1993) Chrytosa-hybrid II  Chrytosa-hybrid III Chrytosa-hybrid IV Chrytosa-hybrid VI SSTT733

An alternativ way of producing tetraploid and, therefore, fertile Chrytosa hybrids is the crossing of Tetra-Sino-Sibiricas with tetraploid forms of Iris setosa. Such a cross of us has produced a seedling, which flowered in 2000 for the first time. It produced a single seed after self pollination. The resulting seedling should flower in 2003. The mother plant of this seedling is shown in the following picture.
 

"Starting Chrytosa"

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