Hippeastrum Herbert, amaryllis, has yielded popular large-flowered hybrids over a 200-year breeding history (Meerow, 2009). Double flower may increase the horticultural value of the plant and have significant market appeal. Significant breeding for double-flowered amaryllis was first reported by McCann (1937). Additional tepal-like structures in double-flowered amaryllis apparently result from transformations of both male and female reproductive structures (Bell, 1977). Double-flowered amaryllis may not have any functional reproductive parts or may produce some pollen-containing anthers at the ends of some of transformed, petal-like stamens, while the ovary is extremely reduced with little or no stigmatic tissue (Meerow, 2000).
The majority of amaryllis species/cultivars do not have fragrant flowers (Meerow, 2000). Although no genetic analysis has been preformed, Meerow (2009) have drawn two hypotheses: (1) Floral fragrance is a recessive trait and (2) expression of fragrance is perhaps under only a single gene control.
Amaryllis is used extensively in landscaping and for cut flowers in tropical and subtropical areas. Growers have been seeking tall, double-flowered, and fragrant cultivars, which are popular for plantscaping and flower arrangements in a variety of creative ways. The development and characteristics of a new double-flowered cultivar, T.S.S. No.1-Pink Pearl, is described below.
Brewbaker, J.L. & Kwack, B.H. 1963 The essential role of calcium ion in pollen germination and pollen tube growth Amer. J. Bot. 50 859 865
Meerow, A.W. 2000 Breeding amaryllis, p. 174–195. In: D.J. Callaway and M.B. Callaway (eds.). Breeding ornamental plants, Portland, OR
Read, V.M. 2004 Hippeastrum: The gardener’s amaryllis. Royal Horticultural Society plant collector guide. Timber Press, Cambridge, UK
Royal Horticultural Society 2001 The Royal Horticultural Society’s colour chart. 4th ed. Royal Hort. Soc., London