Taxon ID:
Usage Facet: class=edible; edible_score=1.0; ornamental_score=0.0; inferred_from_taxon=no
Relationships: 0 | Linked Entities (visible): 0 | Evidence claims: 13 | History events: 0 | Catalog issue offerings: 0
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Evidence Badge: emerging | claims=13 | sources=1 | contradictions=0
Claim Types: description_snippet:3, taxon_context:2, breeder_reference:1, caption_context:1, fruit_size:1, growth_habit:1, productivity:1, recommendation_context:1, source_reference_abbreviation:1 | Open evidence summary JSON | Open citation drawer JSON
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Potomac is a Rubus cultivar sold in this 1937 northern fruit catalog as a new purple cap raspberry. The price table also lists it under black raspberries. The catalog calls it a United States Department of Agriculture introduction and presents it as suited to northern planting, with emphasis on winter survival and heavy crops. [S1]
The source gives no parentage, breeder, release year, or place of origin beyond the USDA introduction statement. It shows Potomac for sale by Fruit Growers Service Co. in 1937, with one-year standard plants offered. [S1]
The fruit description is short and strong. Potomac is pictured and described as carrying heavy loads of big berries. The catalog calls it the most productive of all raspberries, based on the seller's trial plots over the previous three years, where it reportedly outyielded all other raspberries. [S1]
The plant is described as vigorous and productive. The catalog says the bushes have splendid vigor, are exceptionally resistant to anthracnose, and, to the seller's knowledge, had never shown traces of mosaic. [S1]
Potomac's hardiness is supported by a winter survival claim, not a zone rating. The catalog says it came through the unfavorable 1933 and 1934 seasons without winter covering and still produced a heavy crop. It presents Potomac as making profitable purple cap raspberry growing possible in the North. [S1]
Taxonomically, the source places Potomac among raspberries in Rubus. It does not state its exact species background. The heading calls it a purple cap, while the price table lists it under black raspberries. The safest reading is that the catalog treated it in the blackcap or purple cap raspberry group, not as a red raspberry. [S1]
Summary source basis
This summary currently draws chiefly from Hardy fruits for Northern planting, trees, shrubs, 1937.
Direct parent cultivars
Parentage claim text
Derived or downstream cultivar links
Source-story quotations
Taxonomy context: No family-tree context surfaced yet.
Related cultivars mentioned in source context
Zone assertions are structured rows. Hardiness claim text appears in evidence claims and page-linked citations.
| Zone Min | Zone Max | Zone Text | Assertion Type | Outcome | Location | Confidence |
|---|---|---|---|---|---|---|
| No explicit zone assertion rows yet. | ||||||
No linked media assets.
| Document | Title/URL | Rights | Claims | Relationships | History Events | Pages | Snippets |
|---|---|---|---|---|---|---|---|
| 105 | Hardy fruits for Northern planting, trees, shrubs, 1937 | unknown | 13 | 0 | 0 | p12 p13 | A photo on the page is captioned Potomac.; Prices for Potomac are referenced on page 8.; The catalog states that to its knowledge Potomac has never shown any traces of mosaic.; Potomac is said to be exceptionally resista |
| Document | Page | Claim Type | Claim | Quote | Match |
|---|---|---|---|---|---|
| 105 | p13 | caption_context | Aphoto on the page is captioned Potomac. | New Purple Cap POTOMAC MOST PRODUCTIVE OF ALL RASPBERRIES | page_block:0.90 |
| 105 | p13 | source_reference_abbreviation | Prices for Potomac are referenced on page 8. | New Purple Cap POTOMAC MOST PRODUCTIVE OF ALL RASPBERRIES | page_block:0.90 |
| 105 | p13 | description_snippet | The catalog states that to its knowledge Potomac has never shown any traces of mosaic. | New Purple Cap POTOMAC MOST PRODUCTIVE OF ALL RASPBERRIES | page_block:0.90 |
| 105 | p13 | description_snippet | Potomac is said to be exceptionally resistant to anthracnose. | New Purple Cap POTOMAC MOST PRODUCTIVE OF ALL RASPBERRIES | page_block:0.90 |
| 105 | p13 | fruit_size | The plants are described as carrying great loads of big berries. | New Purple Cap POTOMAC MOST PRODUCTIVE OF ALL RASPBERRIES | page_block:0.90 |
| 105 | p13 | growth_habit | The bushes are described as having splendid vigor. | New Purple Cap POTOMAC MOST PRODUCTIVE OF ALL RASPBERRIES | page_block:0.90 |
| 105 | p13 | recommendation_context | The description presents Potomac as enabling profitable purple cap raspberry growing in the North. | New Purple Cap POTOMAC MOST PRODUCTIVE OF ALL RASPBERRIES | page_block:0.90 |
| 105 | p13 | entry_hardiness_observation | Potomac came through unfavorable 1933 and 1934 conditions without winter covering and produced a heavy crop. | New Purple Cap POTOMAC MOST PRODUCTIVE OF ALL RASPBERRIES | page_block:0.90 |
| 105 | p13 | productivity | In the trial plots over the past three years, Potomac surpassed all other raspberries in yield. | New Purple Cap POTOMAC MOST PRODUCTIVE OF ALL RASPBERRIES | page_block:0.90 |
| 105 | p13 | breeder_reference | Potomac is described as an introduction by the United States Department of Agriculture. | New Purple Cap POTOMAC MOST PRODUCTIVE OF ALL RASPBERRIES | page_block:0.90 |
| 105 | p13 | taxon_context | Potomac is presented as a purple cap raspberry. | New Purple Cap POTOMAC MOST PRODUCTIVE OF ALL RASPBERRIES | page_block:0.90 |
| 105 | p12 | description_snippet | Listed in the price table as Potomac, 1-yr. Standard. | BLACK RASPBERRIES Potomac, 1-yr. Standard | page_block:0.90 |
| 105 | p12 | taxon_context | Listed under black raspberries in the price table. | BLACK RASPBERRIES Potomac, 1-yr. Standard | page_block:0.90 |
| Year | Nursery | Catalog Issue | Relation |
|---|---|---|---|
| No catalog issue offerings linked. | |||
| Relation | Type | ID | Label |
|---|---|---|---|
| No linked entities at this filter level. | |||
| Type | Claim | Confidence |
|---|---|---|
| caption_context | A photo on the page is captioned Potomac. | 0.97 |
| source_reference_abbreviation | Prices for Potomac are referenced on page 8. | 0.86 |
| description_snippet | The catalog states that to its knowledge Potomac has never shown any traces of mosaic. | 0.90 |
| description_snippet | Potomac is said to be exceptionally resistant to anthracnose. | 0.95 |
| fruit_size | The plants are described as carrying great loads of big berries. | 0.88 |
| growth_habit | The bushes are described as having splendid vigor. | 0.93 |
| recommendation_context | The description presents Potomac as enabling profitable purple cap raspberry growing in the North. | 0.93 |
| entry_hardiness_observation | Potomac came through unfavorable 1933 and 1934 conditions without winter covering and produced a heavy crop. | 0.95 |
| productivity | In the trial plots over the past three years, Potomac surpassed all other raspberries in yield. | 0.96 |
| breeder_reference | Potomac is described as an introduction by the United States Department of Agriculture. | 0.95 |
| taxon_context | Potomac is presented as a purple cap raspberry. | 0.98 |
| description_snippet | Listed in the price table as Potomac, 1-yr. Standard. | 0.98 |
| taxon_context | Listed under black raspberries in the price table. | 0.96 |
| ID | Type | Year | Label |
|---|---|---|---|
| No history events. | |||