Taxon Details
Polygonum marinense
Marin knotweed
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Taxon Summary:
Polygonum marinense, commonly known as Marin knotweed, is a annual herb in the Polygonaceae that is found only in California. It occurs within Marshes and swamps (brackish, and coastal salt), growing at elevations from 0 to 10 meters. Polygonum marinense is ranked 3.1, Plants About Which We Need More Information, A Review List; Seriously threatened in California.|
Scientific Name: Polygonum marinense Mertens & Raven |
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Common Name: Marin knotweed |
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| Family: | Polygonaceae | |
| Element Code: | PDPGN0L1C0 | |
| USDA Plants Symbol: | POMA15 | |
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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: | 3.1 |
| Fed List: | None |
| State List: | None |
| Global Rank: | G2Q |
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State Rank: |
S2 |
| Other Status: | |
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CRPR Changes: changed from 3.1 to 3.1 on 2008-07-14 |
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| Add Date: | 1974-01-01 |
| Date Edited: | 2021-05-26 |
| Lifeform: annual herb | ||||||||||||||
Blooming Period: (Apr)May-Aug(Oct)
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Elevation:
0 - 10 meters 0 - 35 feet |
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General Habitats:
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| Microhabitat Details: | ||||||||||||||
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Microhabitat:
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| Threat List Total: | 9 | |
| Total EOs | % of EOs | |
| EOs with Threat Listed: | 17 | 53 % |
| THREAT LIST: | ||
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| Grazing | 14 | 43% |
| Foot traffic/trampling | 9 | 28% |
| Altered flood/tidal/hydrologic regime | 2 | 6% |
| Development | 1 | 3% |
| Erosion/runoff | 1 | 3% |
| Non-native plant impacts | 1 | 3% |
| Other | 1 | 3% |
| Recreational use (non-ORV) | 1 | 3% |
| Vandalism/dumping/litter | 1 | 3% |
| Total Occurrences: | 32 | ||||
| Element Occurrence Ranks: | |||||
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| A | B | C | D | X | U |
| 2 | 13 | 9 | 0 | 0 | 8 |
| Occurrence Status: | |||||
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| Historical >20 Years | 27 | ||||
| Recent <=20 Years | 5 | ||||
| Presence: | |||||
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| Presumed Extant | 32 | ||||
| Possibly Extirpated | 0 | ||||
| Presumed Extirpated | 0 | ||||
| California Endemic: | |||||||||||||
| California Island: | |||||||||||||
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States: Name (Code) California (CA) |
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California Counties and Islands: Name (Code) Alameda (ALA), Contra Costa (CCA), Marin (MRN), Napa (NAP), San Francisco (SFO), Solano (SOL), Sonoma (SON) |
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Quads: Name (Quad Code) Benicia (3812212), Bodega Head (3812331), Cuttings Wharf (3812223), Drakes Bay (3812218), Hunters Point (3712263), Inverness (3812217), Oakland East (3712272), Oakland West (3712273), Petaluma Point (3812214), Petaluma River (3812225), San Leandro (3712262), San Rafael (3712285), Tomales (3812228) |
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Notes:
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Presumed Extant
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