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

2000 Robert E. Preston, Ph.D.
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
Occurrence Data from DFG
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences: 42
  • Element Occurrence Ranks:
    A B C D X U
    5 10 2 0 0 25
  • Population Status:
    >20 yrs
    <=20 yrs
    30 12
  • Presence:
    Present Extant Possibly Extirpated Extirpated
    42 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,  Holbrook Canyon (675D) 41120A5,  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,  Lake Annie (724A) 41120H1,  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
CNPS, Rare Plant Program. . Inventory of Rare and Endangered Plants (online edition, v8-02). California Native Plant Society, Sacramento, CA. Website http://www.rareplants.cnps.org [accessed ].

39120F3=Antelope Valley (571A) 39120F3;39120F4=Calpine (571B) 39120F4;39120G3=Reconnaissance Peak (587D) 39120G3;41120A5=Holbrook Canyon (675D) 41120A5;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;41120H1=Lake Annie (724A) 41120H1;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