*The database used to provide updates to the Online Inventory is under construction. View updates and changes made since May 2019 here.
Polygonum bidwelliae
Common Name: Bidwell's knotweed
Family: Polygonaceae
Element Code: PDPGN0L0C0
Full Name: Polygonum bidwelliae Wats.

2010 George W. Hartwell
Biology Glossary
Rarity Status Glossary
Occurrence Data from CDFW
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences:
  • Element Occurrence Ranks:
    A B C D X U
  • Population Status:
    >20 yrs
    <=20 yrs
  • Presence:
    Present Extant Possibly Extirpated Presumed Extirpated
Notes Glossary
  • Possibly threatened by vehicles, foot traffic, soil erosion, and non-native plants. See Proceedings of the American Academy of Arts and Sciences 14:294 (1879) for original description.
  • 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: 2012-08-02
Location Glossary
  • Elevation: 60 - 1200 meters
  • California Endemic: yes
  • Other States:
  • California Counties and Islands:   name (code)
    Butte (BUT),  Shasta (SHA),  Tehama (TEH)
  • Quads:   name (DWR code) USGS code
    Cherokee (576A) 3912165,  Shippee (576C) 3912156,  Paradise West (592C) 3912176,  Paradise East (592D) 3912175,  Campbell Mound (593A) 3912187,  Richardson Springs (593D) 3912177,  Devils Parade Ground (608C) 4012116,  Panther Spring (609A) 4012127,  Dewitt Peak (609B) 4012128,  Acorn Hollow (609C) 4012118,  Tuscan Springs (610A) 4012221,  Los Molinos (610D) 4012211,  Finley Butte (627D) 4012137,  Tuscan Buttes Ne (628A) 4012241,  Bend (628C) 4012232,  Dales (628D) 4012231,  Inwood (645C) 4012158
  • 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 1395
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 ].

3912165=Cherokee (576A) 3912165;3912156=Shippee (576C) 3912156;3912176=Paradise West (592C) 3912176;3912175=Paradise East (592D) 3912175;3912187=Campbell Mound (593A) 3912187;3912177=Richardson Springs (593D) 3912177;4012116=Devils Parade Ground (608C) 4012116;4012127=Panther Spring (609A) 4012127;4012128=Dewitt Peak (609B) 4012128;4012118=Acorn Hollow (609C) 4012118;4012221=Tuscan Springs (610A) 4012221;4012211=Los Molinos (610D) 4012211;4012137=Finley Butte (627D) 4012137;4012241=Tuscan Buttes Ne (628A) 4012241;4012232=Bend (628C) 4012232;4012231=Dales (628D) 4012231;4012158=Inwood (645C) 4012158