Abstract
A range of almost 1400 cross combinations has been carried out between 31 species ofTulipasubgenusTulipa.Most of the sections are well separated reproductively from each other. The designated species aggregates in sectionClusianaeappeared to be intersterile. Also in sectionKolpakowskianaethe species, as far as used, cannot be combined. Some crosses between species of sectionTulipanumsucceeded. The species of sectionsEichleresandTulipa(including the cultivated tulipT. gesneriana) could be combined in various ways, although the highest level of seed set was achieved within either section. The crossability data support the current taxonomic division. The level of reproductive isolation between sympatric species is discussed, and the importance of crossability studies for plant breeding inTulipapointed out briefly.
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