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Guo-Gui Ning, Xue-Ping Shi, Hui-Rong Hu, Yan Yan, and Man-Zhu Bao

diverse array of varieties ( Griesbach, 2007 ). As the most popular petunia varieties, double-flowered petunias had been well studied from an anatomical angle, but the genetic background of the double-flower form in petunia has not been investigated

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Pei-Wen Kan, Yu-Ching Cheng, and Der-Ming Yeh

, and that double flower is dominant over single flowers. The double-flowered heterozygote occasionally has markedly fewer petals than the double-flowered homozygote of gloxinia ( Clayberg, 1975 ; Shalit, 2000 ). Double-flowered gloxinia cultivars with

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Huan-Keng Lin, Tzu-Yao Wei, Chin-Mu Chen, and Der-Ming Yeh

the genetics and inheritance of trailing habit and flower form, and 3) develop new periwinkle progeny with trailing habit and double flowers. Materials and Methods All the plants were raised from seeds, and young plants were transplanted into 9-cm pots

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Ting Zhou, Hao Jiang, Wangxiang Zhang, Donglin Zhang, Junjun Fan, Quanquan Zhang, Guibin Wang, and Fuliang Cao

. 3B ), and highly doubled flowers (15–26 petals) that are deep cup-shaped with numerous stamens (40–50). Petals are elliptical and overlapping, with no prominent veins. The petal color of the outer side is red-purple (Royal Horticultural Society Color

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Junjun Fan, Wangxiang Zhang, Donglin Zhang, Ting Zhou, Hao Jiang, Guibin Wang, and Fuliang Cao

, flowering crabapples, peonies, plum flowers, and orchids have been elected as the four greatest spring blossoms ( Wang, 2010 ). Unlike some members in the rose family with mutation into double flowers, such as roses ( Bendahmane et al., 2013 ; Dubois et al

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Rozlaily Zainol, Dennis P. Stimart, and Ray F. Evert

Anatomical analysis was performed using a double-flowered mutant of Nicotiana alata Link & Otto. Flower doubleness resulted from petaloid modification of the androecium. Vascularized petal-like outgrowths arose from the anther, connective, and filament of the stamen. The vasculature in petaloid outgrowths from the anther and upper part of the filament originated from and was continuous with the vascular bundle of the filament. In contrast, the vascular bundles formed in the outgrowths from the lower part of the filament developed independently of the vascular bundle of the filament and were not connected to it at any time. Emergences consisting of epidermal and ground parenchyma tissue and lacking vascularization arose from the filament.

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Rozlaily Zainol and Dennis P. Stimart

A double-flower form of Nicotiana alata Link & Otto was characterized genetically as a monogenic recessive trait expressed when homozygous. Reciprocal crosses demonstrated no maternal effect on expression of double flowers. A single dominant gene expressed in the homozygous or heterozygous state caused the single-flower phenotype. The symbol fw is proposed to describe the gene controlling double-flower phenotype.

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Sandra M. Reed and Timothy A. Rinehart

landscape. During its several centuries of cultivation in Japan, numerous cultivars of H. macrophylla ssp. serrata (including double-flower, variegated, and colored leaf forms) were selected ( Dirr, 2004 ). A Hydrangea checklist was published

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Mozhgan Zangeneh and Hassan Salehi

double flowers (5 accessions). Subcluster B contained two accessions of Shahla with 60% similarity ( Fig. 2 ). In each subcluster, single and double flowers formed separate clusters. Accession 5 fell between 3 (semidouble flower) and 7 (double flower

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James N. Moore, Roy C. Rom, Stanley A. Brown, and Gerald L. Klingaman

Three ornamental peaches and one ornamental nectarine were released in 1992 from the Arkansas peach breeding program. `Tom Thumb' is a red-leaf dwarf peach with attractive foliage that is retained throughout summer. `Leprechaun' is a green-leaf dwarf nectarine with small but attractive, freestone fruits. `Crimson Cascade' and `Pink Cascade' are red-leaf peaches with trees of standard size that exhibit a weeping growth habit. `Crimson Cascade' produces double flowers that are dark red while `Pink Cascade' double flowers are pink. The attractive plants of these cultivars should be of value in home landscapes.