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World of CitrusWorld of CitrusWalters Grapefruit
J.V. da Graça, E.S. Louzada, and J.W. Sauls · Proceedings of the International Society of Citriculture · 2004
The paper identifies Walters as a white-fruited Florida seedling of Duncan discovered in 1887, and says Foster was found as a Walters bud sport in 1907 (p. 369). Historical synthesis, not new genetic evidence.
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Robert E. Rouse, Heinz K. Wutscher, and Charles O. Youtsey · Subtropical Plant Science · 2001
The authors describe Walters as a midseason, seedy white grapefruit seedling originating near Belleview, Marion County, Florida, in 1887 on Mr. Walters’ property (printed p. 2). They report that the 1907 pink-fleshed limb sport was named Foster by Royal Palms Nursery after finder R. B. Foster. This is a secondary historical account citing Hodgson (1967); property ownership does not establish a breeder credit. The 1907 fruit description is source-specific and differs from the 2004 account of membrane pigmentation.
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Graham H. Barry et al. · The Genus Citrus · 2020
The ScienceDirect Topics page displays an excerpt from “Commercial scion varieties,” section 5.2, in The Genus Citrus (2020). The chapter describes Walters as a Duncan seedling with little commercial importance and reports the Walters-to-Foster (1907) and Foster-to-Hudson (1930) history. Its “>50 seeds per fruit” statement is explicitly about Foster, not Walters. This is a secondary chapter excerpt, not primary genetic evidence.
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