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World of CitrusWorld of CitrusFoster Grapefruit
University of California, Riverside — Citrus Variety Collection
https://citrusvariety.ucr.edu/crc1198 (opens in a new tab)
Accessed
J.V. da Graça, E.S. Louzada, and J.W. Sauls · Proceedings of the International Society of Citriculture · 2004
The paper reports Foster as a Walters bud sport found in Florida in 1907 and the first pink-pigmented grapefruit variety in its account; it distinguishes membrane pigmentation in Foster from the later flesh pigmentation described for Pink Marsh/Thompson (p. 369).
Accessed
Graham H. Barry et al. · The Genus Citrus · 2020
ScienceDirect Topics excerpt from section 5.2 of The Genus Citrus (2020). The chapter reports Foster was highly seeded, with more than 50 seeds per fruit; this is a source-attributed cultivar statement, not a specimen measurement.
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Citrus ID / IDtools · 2011-10
https://idtools.org/citrus_id/index.cfm?packageID=1179&entityID=8552 (opens in a new tab)
Citrus ID entry for Foster quotes Hodgson (1967) for origin/discovery/introduction and supplies descriptive morphology. Its category-coded key description has no accession, date, sample size or measurement protocol; photo captions include Riverside, California and Winter Haven, Florida. The references list competing taxonomic treatments, not a resolution of Foster’s classification.
Accessed
Robert E. Rouse; Heinz K. Wutscher; Charles O. Youtsey · Subtropical Plant Science · 2001
The authors' historical account states that Foster was observed in 1907 as a pink-fleshed, seedy limb sport of Walters and was called Foster by Royal Palms Nursery after finder R. B. Foster. The passage is secondary history, not a contemporaneous origin record; it also describes Walters as a midseason seedy white grapefruit with a reported 1887 seedling origin near Belleview, Florida (printed p. 2, PDF p. 2).
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Ana Paula de Moraes; Walter dos Santos Soares Filho; Marcelo Guerra · Springer · 2007
https://pubmed.ncbi.nlm.nih.gov/17295131/ (opens in a new tab)
Chromosome Research 15(1), 115–121 (2007); DOI 10.1007/s10577-006-1101-2. The PubMed abstract reports sequential CMA/DAPI staining and rDNA-FISH for six grapefruit, two pummelos and one tangelo. It places Foster Grapefruit in the group reported to have two CMA-positive C-type and six D-type chromosomes, with four reported 45S rDNA sites. Two chromosomes carried 5S rDNA across the accessions. Full text was not available in the inspected publisher view. These marker patterns are not a ploidy determination, full chromosome count, shared cultivar identity or proof of this cultivar's parentage.
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C. Chen; P. Cancalon; C. Haun; F. Gmitter Jr. · American Society for Horticultural Science; Journal of the American Society for Horticultural Science · 2011; 136(5):358–363; DOI 10.21273/JASHS.136.5.358
https://journals.ashs.org/view/journals/jashs/136/5/article-p358.xml (opens in a new tab)
The accessible abstract includes Foster Grapefruit among the cultivars analyzed and reports 6.48 mg/L bergamottin, 14.38 mg/L 6,7-dihydroxybergamottin, and 6.11 mg/L paradisin C. It does not specify the Foster accession, collection site, harvest date, or analytical replication.
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Prita Sari Dewi; Akira Wakana; Yuu Tanimoto; Yumiko Fujiwara; Kaori Sakai; Kohei Kajiwara · Journal of the Japanese Society for Horticultural Science 82(3):203–214 · 2013
https://www.jstage.jst.go.jp/article/jjshs1/82/3/82_203/_html/-char/en (opens in a new tab)
Primary cultivar-specific experimental evidence. Table 1 classifies embryo number and male fertility; embryo means were measured under a stereoscopic microscope in twenty seeds per cultivar, except Foster Pink and Marsh whose embryo count was not examined. Table 2 reports selected zygotic progeny from controlled crosses; it is not a percentage of all seeds that are zygotic. Material grown at Sasaguri Orchard, Kyushu University Farm, Fukuoka, Japan. Preserve the difference between parent fertility and male fertility segregating among offspring. DOI:10.2503/jjshs1.82.203. Source captured in docs/research/breeding-keywords-2026-10-10/dewi-2013.html.
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