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World of CitrusWorld of CitrusMarr's Early Sweet Orange
University of California, Riverside — Citrus Variety Collection
https://citrusvariety.ucr.edu/crc3865 (opens in a new tab)
Accessed
Citrus ID
https://idtools.org/citrus_id/index.cfm?packageID=1179&entityID=8666 (opens in a new tab)
Edition 2 (October 2011), entry “Marrs,” synonym field including “Marrs Early” and “Marsh Early.” The historical section attributes the 1927 Donna, Texas limb-sport account and commercial availability by 1940 to Hodgson (1967), citing Waibel (1953). It says navel is absent for the cultivar; the navel-orange trees refer to the planting in which the sport was reported. Morphology describes a compact, dense, nonweeping tree with absent or nonpersistent thorns, and round-to-oblate medium-large fruit with rind/seeding descriptions. Its general field says “acidic-sweet,” while the Hodgson supplement says juicy flesh “lacking in acid” and sweet flavor; these are qualitative descriptions without a measurement or method.
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Mary Cennamo · Bexar County Master Gardeners
https://bexarmg.org/wp-content/uploads/2020/06/Marrs-Early-Orange.pdf (opens in a new tab)
Two-page PDF; no publication date visible. Cennamo reports her in-ground Marrs Early tree in a sheltered San Antonio backyard microclimate has grown there for at least 20 years; she describes it as about 12 × 12 ft, with roughly one-inch branch thorns and gardenia-scented spring flowers. Rootstock and measurement methods are unstated. Her fruit description says navel-sized, without thick skin, and very few seeds; this differs from the UCR/Hodgson account of medium-thick rind and moderate seeds depending on pollination. The page says the tree can survive “down to 26 degrees,” but no temperature unit, measurement method, duration, or specific tree-level exposure is provided; it is not recorded as a cold threshold. Her tree’s shelter and microclimate are described. The PDF repeats the attributed 1927 limb-sport account without independent historical documentation.
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University of California Agriculture and Natural Resources
https://ucanr.edu/sites/default/files/2017-02/256206.pdf (opens in a new tab)
Six-page PDF. On PDF page 3, the “Citrus Selection Guide” chart lists Marrs among oranges; its graphic yellow bar indicates an approximate October-to-February harvest season, not exact dates or a sample observation. A later page credits material to Citrus: How to Select, Grow and Enjoy, but does not establish authorship or publication date for the page-3 chart.
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Pittman & Davis · Pittman & Davis · 2013-04-06
https://blog2.pittmandavis.com/texas-citrus-orange-varieties/ (opens in a new tab)
The page describes Marrs as an early-season navel orange, says it may mature as early as September in some years and is sold through January, and calls it “generally seedless.” These are commercial/consumer statements without a cited trial, specific year/location, or seed-count method. The navel label and categorical seedlessness conflict with the UCR/Citrus ID account that says navel is absent and describes seediness as pollination-dependent; preserve them as source-specific claims rather than adopting them as established cultivar traits.
Accessed
H. K. Wutscher; A. V. Shull · Journal of the American Society for Horticultural Science · 1976-03-01
https://doi.org/10.21273/JASHS.101.2.158 (opens in a new tab)
101(2):158–161. The DOI identifies the March 1976 article. Retrieved evidence is partial: the ResearchGate PDF/HTML reader exposed p. 158 (abstract, introduction, and methods), not the complete results pages or tables. The abstract reports Marrs on Swingle citrumelo was more productive than on Texas sour orange, Cleopatra, and eight other rootstocks, with large fruit; Brix was 0.8 percentage points lower than on Texas sour orange and acid content similar. These are comparative trial results, not sensory taste scores or absolute measurements. The captured methods describe a December 1964 South Texas planting with 3.4 × 6.7 m spacing on bench-leveled land. Do not infer the uncaptured detailed table values.
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