Polygonum marinense
Common Name: Marin knotweed
Family: Polygonaceae
Element Code: PDPGN0L1C0
Full Name: Polygonum marinense Mertens & Raven

2001 Doreen L. Smith
Biology Glossary
Rarity Status Glossary
Occurrence Data from CDFW
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences: 32
  • Element Occurrence Ranks:
    A B C D X U
    2 13 9 0 0 8
  • Population Status:
    >20 yrs
    <=20 yrs
    13 19
  • Presence:
    Present Extant Possibly Extirpated Presumed Extirpated
    32 0 0
Notes Glossary
  • Move to List 1B? Known from fewer than twenty occurrences. Taxonomic status uncertain, related to P. aviculare; possibly synonym of P. robertii, a non-native plant. Immediate taxonomic study needed. Threatened by coastal development and foot traffic.
  • To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page.
  • Date Added: 1974-01-01
  • Last Update: 2010-03-15
Location Glossary
  • Elevation: 0 - 10 meters
  • California Endemic: yes
  • Other States:
  • California Counties and Islands:   name (code)
    Alameda (ALA),  Humboldt (HUM),  Marin (MRN),  Napa (NAP),  Solano (SOL),  Sonoma (SON)
  • Quads:   name (DWR code) USGS code
    Oakland East (465C) 3712272,  San Rafael (467A) 3712285,  Benicia (482C) 3812212,  Cuttings Wharf (483A) 3812223,  Petaluma Point (483C) 3812214,  Petaluma River (484A) 3812225,  Tomales (485B) 3812228,  Drakes Bay (485C) 3812218,  Inverness (485D) 3812217,  Bodega Head (503D) 3812331
  • Notes:
      Definitions of codes preceding a county and/or quad:
      * Presumed extirpated
      ? Uncertain about distribution or identity
      ?* Uncertain about distribution, but presumed extirpated if once present
      (?) Occurrence confirmed, but possibly extirpated
      Species may be present in other areas where conditions are favorable. This data should NOT be substituted for pre-project review or for on-site surveys.
Includes unprocessed quads for CRPR 3 and 4 plants; unprocessed location data has not been quality controlled and may contain errors.
Presumed Extant Presumed Extirpated or Unknown 1396
Links to Leading Resources of Taxon Information
Suggested Citation
California Native Plant Society, Rare Plant Program. . Inventory of Rare and Endangered Plants of California (online edition, v8-03). Website http://www.rareplants.cnps.org [accessed ].

3712272=Oakland East (465C) 3712272;3712285=San Rafael (467A) 3712285;3812212=Benicia (482C) 3812212;3812223=Cuttings Wharf (483A) 3812223;3812214=Petaluma Point (483C) 3812214;3812225=Petaluma River (484A) 3812225;3812228=Tomales (485B) 3812228;3812218=Drakes Bay (485C) 3812218;3812217=Inverness (485D) 3812217;3812331=Bodega Head (503D) 3812331