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Dale T. Lindgren and Daniel M. Schaaf

and the failure to register new Penstemon cultivar names with the appropriate authority ( Lindgren, 1993 ). In addition, the correct parentage of “natural hybrids” is rarely known with certainty. Interspecific hybrids offer the opportunity to

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Susan M. Hawkins, John M. Ruter, and Carol D. Robacker

species of Dissotis and Tibouchina to create interspecific and intergeneric hybrids of these genera. Materials and Methods Several species of Dissotis and Tibouchina were placed in a greenhouse in Athens, GA in Feb. 2012 ( Table 1 ). Stock plants

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Mariola Plazas, Santiago Vilanova, Pietro Gramazio, Adrián Rodríguez-Burruezo, Ana Fita, Francisco J. Herraiz, Rajakapasha Ranil, Ramya Fonseka, Lahiru Niran, Hemal Fonseka, Brice Kouassi, Abou Kouassi, Auguste Kouassi, and Jaime Prohens

interspecific hybridization is the direction of the cross, as this may affect its rate of success, the number of seeds produced, as well as the dormancy of the seeds due to maternal effects ( Morgan et al., 2010 ). In this respect, using S. melongena as the

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Susan M. Hawkins, John M. Ruter, and Carol D. Robacker

as several species of Baptisia , including B. australis , based on internal transcribed spacer sequences ( Wang et al., 2006 ; Zhang et al., 2015 ). Thermopsis interspecific hybrids have not been observed by taxonomists ( Dement and Mabry, 1975

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Mary Lewis, Matthew Chappell, Paul A. Thomas, Rebekah C. Maynard, and Ockert Greyvenstein

successful, naturally occurring interspecific hybridization via pollinator activity ( Wyatt and Broyles, 1994 ). Asclepias is also unusual in that they have two independent ovaries and, if pollinia are inserted perfectly, all subsequent seed will share a

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Cecil Pounders, Tim Rinehart, and Hamidou Sakhanokho

large tree, is limited to southern Florida, coastal California, and Hawaii. In 1963, a chance interspecific seedling (‘Basham's Party Pink’) between L. fauriei and L. indica was discovered in Conroe, TX ( Egolf and Andrick, 1978 ). This discovery

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Chunqing Sun, Zhihu Ma, Zhenchao Zhang, Guosheng Sun, and Zhongliang Dai

lilies. To obtain desired traits of interest in cultivars, breeders have tried to make interspecific hybridizations. In the past, interspecific hybridizations in water lily have been performed for the hope of creating a blue hardy water lily hybrid, but

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Jason D. Lattier and Ryan N. Contreras

, nationwide sales topped 1.8 million generating more than $20 million in total revenues ( U.S. Department of Agriculture, 2016 ). Intraspecific and interspecific hybridization have proven to be valuable methods for the development of lilac cultivars

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Ronald S. Revord, Sarah T. Lovell, John M. Capik, Shawn A. Mehlenbacher, and Thomas J. Molnar

zones that nearly span the latitudinal range of the United States. Thus, if systematically exploited for breeding interspecific hybrids, C. americana may enable the expansion of commercial hybrid hazelnut production to a wide portion of the eastern and

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Randall J. Marek and Ronald D. Parker

An interspecific hybridization program involving ancestral species of the Begonia Semperflorens Cultorum Group was initiated to expand the genetic base of this group. Viable seeds were recovered from four reciprocal crosses. F, progenies were sterile and phenotypically intermediate between parental types. Fluorescence microscopy revealed evidence of both sporophytic and gametophytic incompatibility. Post-pollnation responses of flower petals were positively correlated with pollen tube growth in stigmatic, stylar, and ovarian tissue. A digital image analyzer was used to facilitate seed counts and to determine the percentage of ovules that developed into seeds. Seed germination percentages ranged from 0-91 for crosses to 80-99 for selfs.