Impatiens crosses were made between Plant Introduction (P.I.) 349629 (2n = 16) and cultivar Tangerine (2n = 8), producing a hybrid (2n = 12) that seemed sterile. A large number of pollinations of the hybrid with 'Tangerine' pollen, however, produced only three progeny with 2n numbers of 8, 9, and 12. The backcross with hybrid pollen on P.I. 349629 produced five progeny, all of which were 2n = 20. None of these backcross progeny has shown fertility at present. Backcrosses involving the hybrids between 32 chromosome P.I. accessions and 'Tangerine' have been unproductive. Eleven of the hybrids (2n = 24) between P.I. 349629 and several of the 32-chromosome P.I. accessions occasionally produced viable pollen. When used on a 'Tange-glow' female, which is a 24-chromosome amphidiploid, numerous progeny resulted, some of which proved to be fertile in subsequent crosses.
Viable pollen-producing hybrids were obtained from the crosses New Guinea Impatiens Plant Introductions (P.I.'s) (2n = 32) × Java Impatiens P.I. 349629(2n = 16). The hybrids were crossed with a 24-chromosome amphidiploid ‘Tangeglow,’ resulting in 2n = 34-chromosome hybrids. One of these 34-chromosome hybrids was crossed with P.I. 349692 (2n = 16), producing two offspring having chromosome counts of 2n = 24 and 2n = 30. Subsequent crosses using the 30-chromosome hybrid showed a continuing tendency for production of viable partly unreduced gametes.
‘Burgundy’ joins the previously released Iowa State F1 hybrid Impatiens (2) in its ability to withstand the rigors of the U.S. Midwest environment while making a colorful addition to the world of bedding plants. ‘Burgundy’ was derived from plant material obtained by the U.S. Plant Introduction Service from New Guinea and nearby islands in 1970(1).
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