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Interspecific hybrids from crosses between H. syriacus x H. paramutabilis and H. syriacus x H. sinosyriacus were obtained. In both cases unilateral incongruity was observed and reciprocal crosses yielded no fruits. In vitro embryo rescue, 11 weeks after pollination, increased the germination capacity of H. syriacus x H. sinosyriacus embryos, while this was not the case for H. syriacus x H. paramutabilis embryos. However, a lot of the generated H. syriacus x H. sinosyriacus seedlings were lost due to variegated and total albinism. In the progeny of H. syriacus ‘Oiseau Bleu’ x H. paramutabilis about 95% of the seedlings had an intermediate flower and leaf morphology compared to both parent plants. Leaves on the adult F1 hybrids showed a polymorphism. In total four different leaf types could be observed on the same plant. This leaf polymorphism also was seen in the progeny of H. syriacus ‘Melwhite’ x H. sinosyriacus ‘Lilac Queen’. In this progeny about 50% of the seedlings had an intermediate flower and leaf morphology compared with the parent plants. The hybrid nature of the seedlings of both progenies was also confirmed by AFLP analysis. Despite the low germination vigour of the pollen of the hybrids, a small F2 generation was obtained from H. syriacus ‘Oiseau Bleu’ x H. paramutabilis.
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