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Ming-Chung Liu and Der-Ming Yeh

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

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Jason D. Lattier and Ryan N. Contreras

picotee flowers in which the petal edges lack pigment. Flower forms included single and double flowers, with some exhibiting hose-in-hose flowers. Double flowers in lilac often represent a case of neoheterotrophy where additional floral whorls lead to

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Cecil T. Pounders and Hamidou Sakhanokho

lowest and widely accepted count. The Linnaean plant type had red double flowers and was believed to be native to China where it was cultivated for its showy flowers ( Kimbrough, 1997 ), although no wild forms of the species are known to exist there. An

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Sandra M. Reed and Lisa W. Alexander

red color ( Reed, 2010 ). Where most cultivars produce single flowers, ‘Snowflake’ produces hose-in-hose double flowers. Hydrangea quercifolia ‘Alison’ produces an equal mix of sterile and fertile flowers, ‘Snowflake’ is known for producing large and

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Claude Richer, Lynn M. Collicutt, Campbell G. Davidson, Larry Dyck, and Caroline Lafond

. The semidouble rounded flowers of Rosa ‘Emily Carr are dark red (53A) and measured 67 to 71 mm in diameter ( A ). The irregularly rounded double flowers of Rosa ‘Champlain’ are 57B and C and measured 74.9 to 96.0 in diameter ( B

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Richard O. Kelly, Zhanao Deng, and Brent K. Harbaugh

) ( Liberty Bailey Hortorium, 1976 ). Subsequent petunia breeding resulted in five petunia class divisions: grandiflora, floribunda, milliflora, multiflora, and spreading. In the 1930s, the first consistently double flowers became available from Japan, whereas

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Shuyin Liang, Xuan Wu, and David Byrne

flower type of single (5–8 petals) vs. double flowers (petal number greater than 8) is controlled by a major gene with the double-type condition being a dominant gene ( Debener, 1999 ). Thus, as the number of petals in single flowers does not vary

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Jianjun Zhang, Wei Zhu, Jaime A. Teixeira da Silva, Yongming Fan, and Xiaonan Yu

structure and morphology of Paeonia lactiflora ‘Dafugui’ double flowers. (a) Overhead view of the flower; (b) side views of the flower. Pictures were taken on 16 May 2017. Schematic diagram of floral structure of a fully opened flower. Figure 4 shows the

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David L. Kidwell-Slak and Margaret R. Pooler

‘Silver Cloud’. Name established on 11 Oct. 2016. ‘Flora-Plena’ ( Burns and Raulston, 1993 ): Cercis siliquastrum with double flowers; may no longer be in cultivation. Name not established as it does not meet the provisions of the ICNCP, Article 21

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Thomas Sotiropoulos, Magdalene Koukourikou-Petridou, Antonios Petridis, Dimitrios Stylianidis, Dimitrios Almaliotis, Ioannis Papadakis, Ioannis Therios, and Athanassios Molassiotis

higher percentage of single flowers (83.3% versus 60.6%), lower percentage of “doubleflowers (9% versus 11%), lower percentage of “triple” flowers (6% versus 17.5%), and lower percentage of “flat” fruits (“fans”) (1.7% versus 10.9%) ( Sotiropoulos et al