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Phylogenetic relationships of seven  Apium  species, including three horticultural types of  A. graveolens,  were assayed for RFLPs using cDNA, chloroplast DNA, and rDNA probes. Most of the probes had been previously mapped in celery. The three horticultural types of  A. graveolens  were found to be less polymorphic than the wild species and in phylogenetic analysis they clustered together. The wild species formed a cluster on the dendrogram corresponding to their origin in the southern hemisphere.  A. nodiflorum,  a wild species from Ethiopia formed a branch on the phylogenetic tree apart from all other species. This, along with morphological considerations, suggests that  A. nodiflorum  should be reclassified outside the genus Apium.

336 PHYLOGENETIC RELATIONSHIPS OF CELERY AND ITS WILD RELATIVES BASED ON RESTRICTION FRAGMENT LENGTH POLYMORPHISMS