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, they are not sensitive against permant low winter temperatures.

SSTT289 "Blueline"-Calsibe-seedling  Dark Clarkei-type-seedling "WESTERN MOVIE"-seedling "Red" Calsibe-seedling Pale Calsibe-seedling Blue Clarkei-type seedling Innominata-type Calsibe-seedling Darkest Calsibe-seedling

Another type of Calsibe
There is a principal possibility to produce hybrides between "normal" Sibiricas (28 chr.) and Iris of the Californicae-Series.  Only a few of such hybrids are described in literature. So far we could produce only one hybrid of this type. A special difficulty in this field is the need for using the Califonicae partner as the mother plant (in contrast to the Calsibes described above). However, the Sibiricas used as pollen partners  are normally flowering much later than the Californicae partner. The picture  below show a flower of our seedling from Iris douglasiana and the early flowering Sibirica PLEASURES OF MAY. The plant is sterile and has well branched stems.

Iris douglasiana x Iris sibirica Pleasures of May

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