Polygonum polygaloides ssp. esotericum
Common Name: Modoc County knotweed
Family: Polygonaceae
Synonyms: Polygonum esotericum
Element Code: PDPGN0L1Y2
Full Name: Polygonum polygaloides Meisn. ssp. esotericum (Wheeler) Hickman
USDA PLANTS Symbol: POPOE

Biology Glossary
  • Lifeform: annual herb
  • Blooming Period: May - September
  • Habitat: mesic.
    • Great Basin scrub
    • Lower montane coniferous forest
    • Meadows and seeps
    • Vernal pools
Rarity Status Glossary
  • Rare Plant Rank: 1B.1
    Rare, threatened, or endangered in California and elsewhere
    .1: Seriously endangered in California
  • Federal Listing Status:
    Not Listed
  • State Listing Status:
    Not Listed
  • State Rank: S2.1
    S2: Imperiled.
    .1: Very threatened.
  • Global Rank: G4G5T2
    T2: Imperiled. G4: (species) Apparently secure, considering populations outside California. G5: (species) Secure, considering populations outside California.
Occurrence Data from DFG
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences: 41
  • Element Occurrence Ranks:
    A B C D X U
    5 10 2 0 0 24
    • Population Status:
    Historic
    >20 yrs    		 Recent
    <=20 yrs
    16 25
  • Presence:
    Present Extant Possibly Extirpated Extirpated
    41 0 0
Notes Glossary
  • Potentially threatened by road construction and development. Possibly threatened by grazing, non-native plants, and trampling. Intermediates to ssp. confertiflorum occur more broadly on Modoc Plateau, to OR. See Madroño 31(4):249-252 (1984) for revised nomenclature.
  • 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: 2012-11-06
Location Glossary
  • Elevation: 885 - 1690 meters
  • California Endemic: yes
  • States: California
  • California Counties and Islands:   name (code)
    Lassen (LAS),  Modoc (MOD),  Plumas (PLU),  Shasta (SHA),  Sierra (SIE)
  • Quads:   name (DWR code) USGS code
    Antelope Valley (571A) 39120F3,  Calpine (571B) 39120F4,  Reconnaissance Peak (587D) 39120G3,  Poison Lake (642B) 40121F2,  Pine Creek Valley (642D) 40121E1,  Corders Reservoir (660C) 40121G2,  Holbrook Canyon (675D) 41120A5,  Ambrose Valley (676A) 41120B7,  Lookout (677B) 41121B2,  Burney Falls (679C) 41121A6,  Washington Mtn. (693B) 41120D8,  Crank Mountain (694B) 41121D2,  Whitehorse (695C) 41121C4,  Davis Creek (708A) 41120F3,  Whittemore Ridge (709B) 41120F6,  Boles Meadows East (710A) 41120F7,  Boles Meadows West (710B) 41120F8,  Ambrose (710C) 41120E8,  Jacks Butte (710D) 41120E7,  Rimrock Lake (711B) 41121F2,  Spaulding Butte (711C) 41121E2,  Knobcone Butte (711D) 41121E1,  Mt. Bidwell (724B) 41120H2,  Pease Flat (726A) 41120H5,  Beaver Mtn. (726B) 41120H6,  South Mtn. (726C) 41120G6,  McGinty Reservoir (726D) 41120G5
  • 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.
Presumed Extant Presumed Extirpated or Unknown 1397
Links to Leading Resources of Taxon Information
Suggested Citation
California Native Plant Society (CNPS). Inventory of Rare and Endangered Plants (online edition, v8-02). California Native Plant Society. Sacramento, CA. Accessed on .
-120.75,41.125

CA
39120F3=Antelope Valley (571A) 39120F3;39120F4=Calpine (571B) 39120F4;39120G3=Reconnaissance Peak (587D) 39120G3;40121F2=Poison Lake (642B) 40121F2;40121E1=Pine Creek Valley (642D) 40121E1;40121G2=Corders Reservoir (660C) 40121G2;41120A5=Holbrook Canyon (675D) 41120A5;41120B7=Ambrose Valley (676A) 41120B7;41121B2=Lookout (677B) 41121B2;41121A6=Burney Falls (679C) 41121A6;41120D8=Washington Mtn. (693B) 41120D8;41121D2=Crank Mountain (694B) 41121D2;41121C4=Whitehorse (695C) 41121C4;41120F3=Davis Creek (708A) 41120F3;41120F6=Whittemore Ridge (709B) 41120F6;41120F7=Boles Meadows East (710A) 41120F7;41120F8=Boles Meadows West (710B) 41120F8;41120E8=Ambrose (710C) 41120E8;41120E7=Jacks Butte (710D) 41120E7;41121F2=Rimrock Lake (711B) 41121F2;41121E2=Spaulding Butte (711C) 41121E2;41121E1=Knobcone Butte (711D) 41121E1;41120H2=Mt. Bidwell (724B) 41120H2;41120H5=Pease Flat (726A) 41120H5;41120H6=Beaver Mtn. (726B) 41120H6;41120G6=South Mtn. (726C) 41120G6;41120G5=McGinty Reservoir (726D) 41120G5