The sweet pea ( Lathyrus odoratus L.) was discovered in Sicily in 1695 ( Rice, 2002 ). Many cultivars have been bred in England and the United States since its introduction in England. Sweet pea cultivation is popular not only in the United
The cultivars of Petunia hybrida Vilm. (hereafter referred to as garden petunias) have been bred since the early 1830s ( Paxton, 1836 ). The progenitors of garden petunias have been presumed to be P. axillaris [= P. axillaris (Lam.) Britton
cultivars ( Amar et al., 2011 ; Kalia et al., 2011 ; Osman et al., 2012 ) and to study the relationships among the genetic, morphological, chemical, and ecological variables ( Melito et al., 2013a ). Previous studies on Mediterranean myrtle populations
in early-season temperatures, then crop losses such as that seen in 2012 will become increasingly common. An important strategy to sustain current production, therefore, will be to develop cultivars that are less prone to early bloom. This will in
For year-round production, growers in the subtropical areas conventionally divide chrysanthemum cultivars or lines into two groups: heat-tolerant (flowering during the natural summer and fall seasons) and heat-intolerant (flowering during the
, 1992 ). Growers, primarily in England, started to develop culinary Rheum rhabarbarum L. cultivars, including the still common cultivars Victoria and Prince Albert ( Turner, 1938 ). Early culinary cultivars were selected from open-pollinated seed of
The classic American juice-grape cultivar Concord was developed in the mid-1800s in Massachusetts ( Cahoon, 1986 ; Schofield, 1988 ). Its parentage is predominantly the wild northern fox grape ( Vitis labrusca ), but one male grandparent was the
Native Americans for food, medicinal purposes, tools, fuel, and shelter ( Turner and Hebda, 1990 ; Turner and Turner, 2008 ; Yanovsky, 1936 ). Europeans brought seeds, scionwood, or trees of their local apple cultivars with them to North America during
collard cultivars are available that vary in phenotypic characteristics, tolerance to disease and environmental conditions, and tendency to exhibit nutritional disorders ( Dufault et al., 1992 ; Farnham and Garrett, 1996 ; Farnham et al., 2001 ; Johnson
Numerous options are available when selecting cultivars. It is not uncommon for a cultivar to perform well in one region or state and poorly in another. This can make selection time-consuming and leave growers unsure about how new cultivars will