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World of CitrusWorld of CitrusSampson Tangelo
University of California, Riverside — Citrus Variety Collection
https://citrusvariety.ucr.edu/crc2418 (opens in a new tab)
Accessed
Walter T. Swingle, T. Ralph Robinson, and E. M. Savage · United States Department of Agriculture · 1931-08
USDA Circular 181. Historical source: Minneola's contemporary description uses Sampson as a fruit, stem-end, flavor, and scab comparator; it does not test present-day trees or establish identity.
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IDtools — Citrus ID · 2011-10
https://idtools.org/citrus_id/index.cfm?packageID=1179&entityID=8792 (opens in a new tab)
Citrus ID Edition 2 (October 2011). Its Sampson origin and additional description reproduce Hodgson (1967), also represented in the existing UCR CRC 2418 account; not independent corroboration of that narrative. The database’s structured morphology entry is separately attributed to Citrus ID and is descriptive, not a new measured sample. See Origin/Description sections.
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T. Ralph Robinson · Proceedings of the Florida State Horticultural Society · 1934
https://journals.flvc.org/fshs/article/download/102840/98771/0 (opens in a new tab)
T. Ralph Robinson, Proc. Fla. State Hort. Soc. 47 (1934), 110–112. The publisher PDF direct-open returned 403; the publisher-hosted URL was returned as searchable full text. Printed pp. 110–111: Robinson reports older Sampson fruit shipped in the December–March window, describes its thin skin as requiring careful handling, and says scab susceptibility and costly spraying contributed to its being discarded. Historical Florida industry account; not a current standardized trial. Newer tangelo claims are not assigned to Sampson.
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Todolí Citrus Fundació
https://todolicitrusfundacio.org/en/variedades-citricos/tangelo-sampson-2/ (opens in a new tab)
Collection page, code TCF-034; no page author or publication date shown. The page reports the 1897 Florida Dancy–grapefruit cross and 1904 selection, medium globose/slightly ovoid orange-yellow fruit, juicy orange pulp and some seeds; its collection availability calendar lists January–April. This is collection-page description/availability, not a dated trial or measured Riverside season.
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USDA National Agricultural Library, Special Collections
https://www.nal.usda.gov/exhibits/speccoll/items/show/296 (opens in a new tab)
NAL item title/caption in the Beverly Thomas Galloway Papers; creator listed as Unknown. The page exposes the catalog caption but not an identifiable underlying manuscript image. Caption attributes the cross as Dancy seed parent × Bowen grapefruit pollen parent at Eustis in March 1897. This conflicts with the already-cited USDA Circular 181 account (grapefruit seed parent × Dancy pollen); retain as a conflicting archival caption, not verified cross direction.
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W. P. Bitters; R. G. Platt; John A. Brusca; N. W. Dukeshire · California Agriculture · 1957-11
Bitters et al., California Agriculture, November 1957, printed pp. 5–7. Reports Sampson as ROOTSTOCK: slow, stunted, much-branched nursery seedlings of acceptable caliper, and bud-union behavior in named scion/rootstock combinations related to budding height. Approximate height observations are specific to reported combinations, not a universal threshold or Sampson fruiting-tree performance.
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Brent Tisserat; Danny Jones; Paul D. Galletta · Journal of the American Society for Horticultural Science · 1988
Tisserat, Jones & Galletta, J. Amer. Soc. Hort. Sci. 113(6) (1988), 957–960. Publisher PDF returned as searchable full text; direct PDF open returned 403. Printed pp. 957–958: Figure 1 identifies Sampson juice vesicles in fruit at 50 and 80 mm; Table 1 lists S/DT/MT forms and 31% branching. Methods: one tree per cultivar, 3–5 fruit, 30 vesicles from one locule per fruit. Single-tree anatomical sample; not taste, chemical composition, or cultivar-wide prevalence.
Accessed
Herbert J. Webber; Walter T. Swingle · U.S. Department of Agriculture · 1905 (reprint from the Yearbook of the Department of Agriculture for 1904)
https://archive.org/details/newcitruscreatio00webb (opens in a new tab)
Sampson account, printed pp. 236–237; physical scans 36 and 43, with plates XVII–XIX on scans 37, 39 and 41. This is an earlier account of the 1897 cross/seedling selection and reported Florida variety traits; the later USDA Circular 181 remains a separate source.
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F. E. Gardner and G. E. Horanic · Proceedings of the Florida State Horticultural Society · 1959-06-13
https://journals.flvc.org/fshs/article/download/101309/97253/130008 (opens in a new tab)
Table 1, printed p. 83, reports adjusted and unadjusted cold-injury ratings and trunk circumference for named rootstocks under Valencia orange tops. The 10-year-old planting was at Weirsdale, Florida; injury followed winter 1957–58 freezes and ratings were made June 18, 1958. The study-specific ratings are comparative rootstock results, not traits of the rootstock variety as a scion or a temperature threshold.
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Walter T. Swingle; T. Ralph Robinson · U.S. Department of Agriculture, Bureau of Plant Industry, Crop Physiology and Breeding Investigations · 1918-04-18
https://archive.org/details/CAT31443278 (opens in a new tab)
C.P. & B.I. Circular no. 4. Printed title page and final page identify authors Swingle and Robinson; Wm. A. Taylor is listed as approving official, not author. Printed pp. 1–3 (PDF pp. 3–5): Sampson and Thornton Florida observations on fruit and maturity. The early Thornton timing is explicitly reported for some trees and its inheritance versus local conditions remained untested. Aggregate canker discussion on p. 3 does not identify cultivars or accessions; no cultivar-specific canker claim is represented here.
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