Taxon Details
Polygonum polygaloides ssp. esotericum
Modoc County knotweed
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Taxon Summary:
Polygonum polygaloides ssp. esotericum, commonly known as Modoc County knotweed, is a annual herb in the Polygonaceae that is found in California and elsewhere. It occurs within Great Basin scrub, Lower montane coniferous forest, Meadows and seeps, and Vernal pools, growing at elevations from 885 to 1690 meters. Polygonum polygaloides ssp. esotericum is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.|
Scientific Name: Polygonum polygaloides Meisn. ssp. esotericum (Wheeler) Hickman |
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Common Name: Modoc County knotweed |
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| Family: | Polygonaceae | |
| Element Code: | PDPGN0L1Y2 | |
| USDA Plants Symbol: | POPOE | |
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Synonyms/Other Names: |
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| Name Status: |
JEF, FNA, POWO, IPNI, Tropicos |
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| CA Rare Plant Rank: | 1B.3 |
| Fed List: | None |
| State List: | None |
| Global Rank: | G4G5T3 |
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State Rank: |
S3 |
| Other Status: | BLM_S; SB_UCSC |
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CRPR Changes: changed from 1B.1 to 1B.3 on 2017-12-13 |
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| Add Date: | 1974-01-01 |
| Date Edited: | 2022-12-06 |
| Lifeform: annual herb | ||||||||||||||
Blooming Period: May-Sep
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Elevation:
885 - 1690 meters 2905 - 5545 feet |
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General Habitats:
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| Microhabitat Details: | ||||||||||||||
Microhabitat:
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Notes: Possibly threatened by grazing, trampling, road maintenance, and non-native plants. Intermediates to ssp. confertiflorum are common, especially on Modoc Plateau to OR. Difficult to distinguish pure stands of ssp. esotericum in CA; needs further study. Only occurrences that mostly contain P. p. ssp. esotericum are included. See Rhodora 40(476):310-312 (1938) for original description, and Madroño 31(4):251 (1984) for revised nomenclature. |
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Threats: |
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Taxonomy: |
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| Threat List Total: | 7 | |
| Total EOs | % of EOs | |
| EOs with Threat Listed: | 9 | 20 % |
| THREAT LIST: | ||
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| Grazing | 6 | 13% |
| Non-native animal impacts | 3 | 6% |
| Foot traffic/trampling | 2 | 4% |
| Mining | 1 | 2% |
| Non-native plant impacts | 1 | 2% |
| Other | 1 | 2% |
| Road/trail construction/maint. | 1 | 2% |
| Total Occurrences: | 45 | ||||
| Element Occurrence Ranks: | |||||
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| A | B | C | D | X | U |
| 5 | 10 | 2 | 0 | 0 | 28 |
| Occurrence Status: | |||||
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| Historical >20 Years | 41 | ||||
| Recent <=20 Years | 4 | ||||
| Presence: | |||||
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| Presumed Extant | 45 | ||||
| Possibly Extirpated | 0 | ||||
| Presumed Extirpated | 0 | ||||
| California Endemic: | |||||||||||||
| California Island: | |||||||||||||
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States: Name (Code) California (CA), Oregon (OR) |
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California Counties and Islands: Name (Code) Modoc (MOD), Plumas (PLU), Shasta (SHA), Sierra (SIE) |
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Quads: Name (Quad Code) Barrel Springs (4111988), Crooks Meadow (4111978), Ambrose (4112058), Antelope Valley (3912063), Beaver Mtn. (4112086), Boles Meadows East (4112067), Boles Meadows West (4112068), Burney Falls (4112116), Calpine (3912064), Crank Mountain (4112142), Davis Creek (4112063), Jacks Butte (4112057), Knobcone Butte (4112151), Lake Annie (4112081), Larkspur Hills (4112071), Lookout (4112122), McGinty Reservoir (4112075), Mt. Bidwell (4112082), Pease Flat (4112085), Reconnaissance Peak (3912073), Rimrock Lake (4112162), South Mtn. (4112076), Spaulding Butte (4112152), Washington Mtn. (4112048), Whitehorse (4112134), Whittemore Ridge (4112066) |
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Notes:
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Presumed Extant
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