Abstract
S. longipes was crossed with 5 other species [S. longifolia, S. calycantha, S. crassifolia, S. crispa, S. graminea]to establish species relationships. Only crosses between S. longipes and S. longifolia resulted in the production of viable F1 seed and hybrid progeny. In the hybrids (2n = 39), chromosome associations at metaphase I showed complete homology between the genomes of the 2 spp. This may suggest a close relationship between the diploid S. longifolia and the polyploid S. longipes.